StringRef ends/startswith-lower -> insensitive

Updating StringRef startswith and endswith API to use insensitive rather
than lower.

Author: etcwilde

lib/AST/DocComment.cpp

@@ -191,7 +191,7 @@ bool extractSeparatedParams(
     auto ParagraphContent = ParagraphText->getLiteralContent();
     auto PotentialMatch = ParagraphContent.substr(0, ParameterPrefix.size());
 
-    if (!PotentialMatch.startswith_lower(ParameterPrefix)) {
+    if (!PotentialMatch.startswith_insensitive(ParameterPrefix)) {
       NormalItems.push_back(Child);
       continue;
     }

lib/Basic/StringExtras.cpp

@@ -392,8 +392,8 @@ static bool matchNameWordToTypeWord(StringRef nameWord, StringRef typeWord) {
     // We can match the suffix of the type so long as everything preceding the
     // match is neither a lowercase letter nor a '_'. This ignores type
     // prefixes for acronyms, e.g., the 'NS' in 'NSURL'.
-    if (typeWord.endswith_lower(nameWord) && 
-        !clang::isLowercase(typeWord[typeWord.size()-nameWord.size()])) {
+    if (typeWord.endswith_insensitive(nameWord) &&
+        !clang::isLowercase(typeWord[typeWord.size() - nameWord.size()])) {
       // Check that everything preceding the match is neither a lowercase letter
       // nor a '_'.
       for (unsigned i = 0, n = nameWord.size(); i != n; ++i) {
@@ -405,7 +405,7 @@ static bool matchNameWordToTypeWord(StringRef nameWord, StringRef typeWord) {
 
     // We can match a prefix so long as everything following the match is
     // a number.
-    if (typeWord.startswith_lower(nameWord)) {
+    if (typeWord.startswith_insensitive(nameWord)) {
       for (unsigned i = nameWord.size(), n = typeWord.size(); i != n; ++i) {
         if (!clang::isDigit(typeWord[i])) return false;
       }

lib/IRGen/IRGenModule.cpp

@@ -1224,7 +1224,7 @@ llvm::SmallString<32> getTargetDependentLibraryOption(const llvm::Triple &T,
     if (quote)
       buffer += '"';
     buffer += library;
-    if (!library.endswith_lower(".lib"))
+    if (!library.endswith_insensitive(".lib"))
       buffer += ".lib";
     if (quote)
       buffer += '"';

lib/Sema/CSStep.cpp

@@ -756,7 +756,7 @@ bool swift::isSIMDOperator(ValueDecl *value) {
   if (nominal->getName().empty())
     return false;
 
-  return nominal->getName().str().startswith_lower("simd");
+  return nominal->getName().str().startswith_insensitive("simd");
 }
 
 bool DisjunctionStep::shortCircuitDisjunctionAt(

tools/SourceKit/lib/SwiftLang/CodeCompletionOrganizer.cpp

@@ -541,7 +541,7 @@ void CodeCompletionOrganizer::Impl::addCompletionsWithFilter(
     if (options.fuzzyMatching && filterText.size() >= options.minFuzzyLength) {
       match = pattern.matchesCandidate(completion->getName());
     } else {
-      match = completion->getName().startswith_lower(filterText);
+      match = completion->getName().startswith_insensitive(filterText);
     }
 
     bool isExactMatch =