Optimize more redundant kotlin/jvm/internal/Refs

The number of initializations of the `value` field before the live range
begins does not really matter so long as we insert a write of a default
value to the local if there were none.

compiler/testData/codegen/bytecodeText/localInitializationLVT/inlineClassVar.kt

@@ -1,5 +1,5 @@
 // IGNORE_BACKEND: JVM_IR
-// TODO KT-36648 Captured variables not optimized in JVM_IR
+// TODO: JVM_IR uses ObjectRef instead of IntRef for the value
 
 fun test(): UInt {
     var c: UInt
@@ -9,5 +9,5 @@ fun test(): UInt {
     return c
 }
 
-// 1 ASTORE 0
-// 1 LOCALVARIABLE c Lkotlin/jvm/internal/Ref\$IntRef; L1 L.* 0
+// 2 ISTORE 0
+// 1 LOCALVARIABLE c I