Fix return types for while loops.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt

@@ -921,7 +921,7 @@ class ExpressionCodegen(
         mv.goTo(continueLabel)
         mv.mark(endLabel)
 
-        return loop.onStack
+        return StackValue.none()
     }
 
     override fun visitBreakContinue(jump: IrBreakContinue, data: BlockInfo): StackValue {
@@ -983,7 +983,7 @@ class ExpressionCodegen(
         generateLoopJump(loop.condition, data, entry, false)
         mv.mark(endLabel)
 
-        return loop.onStack
+        return StackValue.none()
     }
 
     override fun visitTry(aTry: IrTry, data: BlockInfo): StackValue {

compiler/testData/codegen/box/arrays/kt503.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // IGNORE_BACKEND: JS_IR
 // TODO: muted automatically, investigate should it be ran for JS or not
 // IGNORE_BACKEND: JS

compiler/testData/codegen/box/controlStructures/forInIterableWithIndex/forInListWithIndexThrowsCME.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
 // FULL_JDK
 // WITH_RUNTIME

compiler/testData/codegen/box/controlStructures/forInSequenceWithIndex/forInSequenceWithIndexThrowsCME.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
 // FULL_JDK
 // WITH_RUNTIME