JVM: remove support for disabling NoConstantValueAttributeForNonConstVals

This feature is enabled by default since 1.4, which is the earliest
language version supported by Kotlin at this moment.

compiler/testData/codegen/box/constants/kt9532.kt

@@ -1,7 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: MINOR: CONST_EQUIVALENCE
-// !LANGUAGE: -NoConstantValueAttributeForNonConstVals
-// TODO: muted automatically, investigate should it be ran for JS or not
 // IGNORE_BACKEND: NATIVE
 
 object A {
@@ -33,4 +31,4 @@ fun box(): String {
     if (A.bNullable !== B.bNullable) return "Fail 5: A.bNullable !== B.bNullable"
 
     return "OK"
-}
+}

compiler/testData/codegen/box/properties/const/fpNonConstValProperlyInitialized.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: +NoConstantValueAttributeForNonConstVals
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
 

compiler/testData/codegen/box/properties/const/nonConstValsAreProperlyInitialized.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: +NoConstantValueAttributeForNonConstVals +JvmFieldInInterface
 // TARGET_BACKEND: JVM
 // WITH_RUNTIME
 
@@ -64,4 +63,4 @@ fun box(): String {
     assertEquals(400, testTopLevelVal)
 
     return "OK"
-}
+}