Generate switch instruction for 'when' with unsigned subject

compiler/testData/codegen/bytecodeText/unsignedTypes/whenByUnsigned.kt

@@ -0,0 +1,28 @@
+// WITH_RUNTIME
+// IGNORE_BACKEND: JVM_IR
+
+const val M1: UInt = 2147483648u
+
+fun testUInt1(x: UInt) =
+    when (x) {
+        0u -> "none"
+        1u -> "one"
+        2u -> "two"
+        3u -> "three"
+        else -> "many"
+    }
+
+fun testUInt2(x: UInt) =
+    when (x) {
+        0u -> "none"
+        1u -> "one"
+        2u -> "two"
+        3u -> "three"
+        M1 -> "M1"
+        else -> "many"
+    }
+
+// 2 SWITCH
+// ^ This captures both TABLESWITCH and LOOKUPSWITCH; we don't care about nuances of *SWITCH instruction generation here.
+
+// 0 IF_ICMP