Capitalize/decapitalize only ASCII characters across project

Use {de,}capitalizeAsciiOnly and to{Lower,Upper}CaseAsciiOnly where
possible, and stdlib's functions with Locale.US everywhere else.

Otherwise, if the default system locale is Turkish, the capital latin
letter "I" is transformed in toLowerCase to "ı" (see
https://github.com/JetBrains/kotlin/blob/66bc142f92085047a1ca64f9a291f0496e33dd98/libraries/stdlib/jvm/test/text/StringJVMTest.kt#L119),
which for example breaks the codegen for `intArrayOf` in
KT-25400/KT-43405.

Similarly, lower case latin letter "i" is transformed to "İ".

 #KT-13631 Fixed
 #KT-25400 Fixed
 #KT-43405 Fixed

compiler/compiler-runner/src/org/jetbrains/kotlin/compilerRunner/CompilerOutputParser.kt

@@ -30,6 +30,7 @@ import org.xml.sax.SAXException
 import org.xml.sax.helpers.DefaultHandler
 import java.io.IOException
 import java.io.Reader
+import java.util.*
 import javax.xml.parsers.SAXParserFactory
 
 object CompilerOutputParser {
@@ -124,7 +125,7 @@ object CompilerOutputParser {
                 // We're directly inside the root tag: <MESSAGES>
                 return
             }
-            val qNameLowerCase = qName.toLowerCase()
+            val qNameLowerCase = qName.toLowerCase(Locale.US)
             var category: CompilerMessageSeverity? = CATEGORIES[qNameLowerCase]
             if (category == null) {
                 messageCollector.report(ERROR, "Unknown compiler message tag: $qName")