KT-20844 Re-enable stack spilling during inline.

`dx` has entered the final stage of sunset:
https://android-developers.googleblog.com/2020/02/the-path-to-dx-deprecation.html

compiler/testData/codegen/bytecodeText/storeStackBeforeInline/simple.kt

@@ -9,6 +9,6 @@ fun foo() : Int {
 }
 
 // fake inline variables occupy 2 ISTOREs.
-// 5 ISTORE
-// 7 ILOAD
+// 3 ISTORE
+// 5 ILOAD
 // 0 InlineMarker