Migrate compiler, idea and others to new case conversion api

js/js.dce/src/org/jetbrains/kotlin/js/dce/util.kt

@@ -47,7 +47,7 @@ fun Context.isObjectFunction(function: JsExpression, functionName: String): Bool
 fun Context.isKotlinFunction(function: JsExpression, name: String): Boolean {
     if (function !is JsNameRef || function.ident != name) return false
     val receiver = (function.qualifier as? JsNameRef)?.name ?: return false
-    return receiver in nodes && receiver.ident.toLowerCase(Locale.US) == "kotlin"
+    return receiver in nodes && receiver.ident.lowercase() == "kotlin"
 }
 
 fun isSpecialFunction(expr: JsExpression, specialFunction: SpecialFunction): Boolean =

js/js.frontend/src/org/jetbrains/kotlin/js/config/ErrorTolerancePolicy.kt

@@ -18,7 +18,7 @@ enum class ErrorTolerancePolicy(val allowSyntaxErrors: Boolean, val allowSemanti
         val DEFAULT = NONE
 
         fun resolvePolicy(key: String): ErrorTolerancePolicy {
-            return when (key.toUpperCase(Locale.US)) {
+            return when (key.uppercase()) {
                 "NONE" -> NONE
                 "SEMANTIC" -> SEMANTIC
                 "SYNTAX", "ALL" -> ALL

js/js.tests/test/org/jetbrains/kotlin/generators/tests/generateTestDataForReservedWords.kt

@@ -311,7 +311,10 @@ private class TestDataBuilder {
                             .replace(KEYWORD_MARKER, keywordWithEscapeIfNeed)
 
 
-                    val fileName = "${suite.name.decapitalize()}${case.name.capitalize()}${keyword.capitalize()}.kt"
+                    val decapitalizedSuiteName = suite.name.replaceFirstChar(Char::lowercaseChar)
+                    val capitalizedCaseName = case.name.replaceFirstChar(Char::uppercaseChar)
+                    val capitalizedKeyword = keyword.replaceFirstChar(Char::uppercaseChar)
+                    val fileName = "$decapitalizedSuiteName$capitalizedCaseName$capitalizedKeyword.kt"
 
                     val testDataFile = File(testDataDirPath + "/" + fileName)
 

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/functions/factories/ArrayFIF.kt

@@ -109,7 +109,7 @@ object ArrayFIF : CompositeFIF() {
     }
 
     private val PrimitiveType.lowerCaseName
-        get() = typeName.asString().toLowerCase(Locale.US)
+        get() = typeName.asString().lowercase()
 
     fun getTag(descriptor: CallableDescriptor, config: JsConfig): String? {
         if (descriptor !is ConstructorDescriptor) return null