Handle reversed() in ForLoopsLowering.

We get the info for the underlying progression and invert it. For
progressions whose last bound was open (e.g., `until` loop), the
reversed version will have an open first bound and so the induction
variable must be incremented first.

Also unified the way of extracting HeaderInfo out of changed calls
(e.g., `indices.reversed()`), and fixed declaration parents in
ForLoopsLowering.

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/ForInReversedReversedRange.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun intRange() = 1 .. 4
@@ -28,3 +27,8 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 3 getFirst
+// 3 getLast

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedArrayIndices.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun box(): String {
@@ -13,3 +12,11 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 1 IF(_ICMPG|L)T
+// 1 IF

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedCharSequenceIndices.kt

@@ -1,4 +1,5 @@
 // IGNORE_BACKEND: JVM_IR
+// NOTE: Enable once CharSequence.indices is handled
 import kotlin.test.*
 
 fun box(): String {
@@ -13,3 +14,11 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 1 IF(_ICMPG|L)T
+// 1 IF

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedCollectionIndices.kt

@@ -1,4 +1,5 @@
 // IGNORE_BACKEND: JVM_IR
+// NOTE: Enable once Collection.indices is handled
 import kotlin.test.*
 
 fun box(): String {
@@ -13,3 +14,11 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 1 IF(_ICMPG|L)T
+// 1 IF

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedDownTo.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun box(): String {
@@ -24,3 +23,13 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 2 IF_ICMP[LG]T
+// 1 IF[LG]T
+// 3 IF
+// 1 LCMP

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedEmptyRangeLiteral.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 fun box(): String {
     for (i in (4 .. 1).reversed()) {
         throw AssertionError("Loop should not be executed")
@@ -13,6 +12,7 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
 // 0 getStart
 // 0 getEnd
 // 0 getFirst

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedRange.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun intRange() = 1 .. 4
@@ -28,3 +27,8 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 3 getFirst
+// 3 getLast

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedRangeLiteral.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun box(): String {
@@ -24,12 +23,13 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
 // 0 getStart
 // 0 getEnd
 // 0 getFirst
 // 0 getLast
 // 0 getStep
-// 0 IFEQ
-// 0 IF_ICMPEQ
-// 2 IF_ICMPLT
-// 1 LCMP
+// 2 IF_ICMP[LG]T
+// 1 IF[LG]T
+// 3 IF
+// 1 LCMP

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedReversedArrayIndices.kt

@@ -0,0 +1,20 @@
+import kotlin.test.*
+
+fun box(): String {
+    val arr = intArrayOf(1, 1, 1, 1)
+    var sum = 0
+    for (i in arr.indices.reversed().reversed()) {
+        sum = sum * 10 + i + arr[i]
+    }
+    assertEquals(4321, sum)
+
+    return "OK"
+}
+
+// 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedReversedDownTo.kt

@@ -0,0 +1,35 @@
+import kotlin.test.*
+
+fun box(): String {
+    var sum = 0
+    for (i in (4 downTo 1).reversed().reversed()) {
+        sum = sum * 10 + i
+    }
+    assertEquals(1234, sum)
+
+    var sumL = 0L
+    for (i in (4L downTo 1L).reversed().reversed()) {
+        sumL = sumL * 10 + i
+    }
+    assertEquals(1234L, sumL)
+
+    var sumC = 0
+    for (i in ('4' downTo '1').reversed().reversed()) {
+        sumC = sumC * 10 + i.toInt() - '0'.toInt()
+    }
+    assertEquals(1234, sumC)
+
+    return "OK"
+}
+
+// 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 2 IF_ICMP[LG]T
+// 1 IF[LG]T
+// 3 IF
+// 1 LCMP

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedReversedReversedRange.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun intRange() = 1 .. 4
@@ -28,3 +27,8 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 3 getFirst
+// 3 getLast

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedReversedUntil.kt

@@ -0,0 +1,32 @@
+import kotlin.test.*
+
+fun box(): String {
+    var sum = 0
+    for (i in (1 until 5).reversed().reversed()) {
+        sum = sum * 10 + i
+    }
+
+    var sumL = 0L
+    for (i in (1L until 5L).reversed().reversed()) {
+        sumL = sumL * 10 + i
+    }
+
+    var sumC = 0
+    for (i in ('1' until '5').reversed().reversed()) {
+        sumC = sumC * 10 + i.toInt() - '0'.toInt()
+    }
+
+    return "OK"
+}
+
+// 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 2 IF_ICMP[LG]E
+// 1 IF[LG]E
+// 3 IF
+// 1 LCMP

compiler/testData/codegen/bytecodeText/forLoop/forInReversed/forInReversedUntil.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 import kotlin.test.*
 
 fun box(): String {
@@ -21,3 +20,13 @@ fun box(): String {
 }
 
 // 0 reversed
+// 0 iterator
+// 0 getStart
+// 0 getEnd
+// 0 getFirst
+// 0 getLast
+// 0 getStep
+// 2 IF_ICMP[LG]T
+// 1 IF[LG]T
+// 3 IF
+// 1 LCMP