Specialize Comparable#compareTo for boxed primitives

Support Comparable#compareTo for boxed primitive in redundant
boxing/unboxing analysis, along with CHECKCAST to java.lang.Comparable.

Note that we can do that for Float and Double, too, because
Float#compareTo(Float) and Double#compareTo(Double) are delegated to
Float#compare(float, float) and Double#compare(double, double),
respectively.

Fuse specialized comparison for integers with conditional jumps
if possible (both for Comparable#compareTo and Intrinsics#areEqual).

 #KT-11959 Fixed

compiler/testData/codegen/bytecodeText/boxingOptimization/maxMinBy.kt

@@ -0,0 +1,34 @@
+// WITH_RUNTIME
+// FILE: list.kt
+val intList = listOf(1, 2, 3)
+val longList = listOf(1L, 2L, 3L)
+
+// FILE: box.kt
+fun box(): String {
+    val intListMin = intList.minBy { it } ?: -1
+    if (intListMin != 1) return "Fail intListMin=$intListMin"
+
+    val intListMax = intList.maxBy { it } ?: -1
+    if (intListMax != 3) return "Fail intListMax=$intListMax"
+
+    val longListMin = longList.minBy { it } ?: -1
+    if (longListMin != 1L) return "Fail longListMin=$longListMin"
+
+    val longListMax = longList.maxBy { it } ?: -1
+    if (longListMax != 3L) return "Fail longListMax=$longListMax"
+
+    return "OK"
+}
+
+// @BoxKt.class:
+// -- no boxing
+// 0 valueOf
+// -- no compareTo
+// 0 compareTo
+// -- comparisons are properly fused with conditional jumps
+// 0 ICONST_0
+// 1 IF_ICMPGE
+// 1 IF_ICMPLE
+// 4 LCMP
+// 1 IFGE
+// 1 IFLE