llvm::StringRef equals_lower -> equals_insensitive

The `equals_lower` API was replaced with `equals_insensitive` in llvm
commit 2e4a2b8 and
3eed57e.

Ran git clang-format.

Author: etcwilde

lib/AST/DocComment.cpp

@@ -115,7 +115,7 @@ bool extractParameterOutline(
     }
 
     auto HeadingContent = HeadingText->getLiteralContent();
-    if (!HeadingContent.rtrim().equals_lower("parameters:")) {
+    if (!HeadingContent.rtrim().equals_insensitive("parameters:")) {
       NormalItems.push_back(Child);
       continue;
     }

lib/Basic/StringExtras.cpp

@@ -45,8 +45,8 @@ bool swift::canBeMemberName(StringRef identifier) {
 }
 
 bool swift::isPreposition(StringRef word) {
-#define PREPOSITION(Word)                       \
-  if (word.equals_lower(#Word))                 \
+#define PREPOSITION(Word)                                                      \
+  if (word.equals_insensitive(#Word))                                          \
     return true;
 #include "PartsOfSpeech.def"
 
@@ -55,11 +55,11 @@ bool swift::isPreposition(StringRef word) {
 
 PartOfSpeech swift::getPartOfSpeech(StringRef word) {
   // FIXME: This implementation is woefully inefficient.
-#define PREPOSITION(Word)                       \
-  if (word.equals_lower(#Word))                 \
+#define PREPOSITION(Word)                                                      \
+  if (word.equals_insensitive(#Word))                                          \
     return PartOfSpeech::Preposition;
-#define VERB(Word)                              \
-  if (word.equals_lower(#Word))                 \
+#define VERB(Word)                                                             \
+  if (word.equals_insensitive(#Word))                                          \
     return PartOfSpeech::Verb;
 #include "PartsOfSpeech.def"
 
@@ -417,7 +417,7 @@ static bool matchNameWordToTypeWord(StringRef nameWord, StringRef typeWord) {
   }
 
   // Check for an exact match.
-  return nameWord.equals_lower(typeWord);
+  return nameWord.equals_insensitive(typeWord);
 }
 
 /// Match the beginning of the name to the given type name.

lib/IDE/SyntaxModel.cpp

@@ -1624,7 +1624,7 @@ class DocFieldParser {
       ;
     StringRef ident(identStart, ptr - identStart);
 
-    if (ident.equals_lower("parameter")) {
+    if (ident.equals_insensitive("parameter")) {
       if (numSpaces > 1 || !advanceIf(' '))
         return None;
       while (advanceIf([](char c) { return c != ':'; }))
@@ -1634,7 +1634,7 @@ class DocFieldParser {
       return ident;
 
     } else if (advanceIf(':')) {
-      if (ident.equals_lower("parameters") && numSpaces > 1)
+      if (ident.equals_insensitive("parameters") && numSpaces > 1)
         return None;
       auto lowerIdent = ident.lower();
       bool isField = llvm::StringSwitch<bool>(lowerIdent)

lib/Sema/CSDiagnostics.cpp

@@ -3459,7 +3459,7 @@ DeclName MissingMemberFailure::findCorrectEnumCaseName(
   auto candidate =
       corrections.getUniqueCandidateMatching([&](ValueDecl *candidate) {
         return (isa<EnumElementDecl>(candidate) &&
-                candidate->getBaseIdentifier().str().equals_lower(
+                candidate->getBaseIdentifier().str().equals_insensitive(
                     memberName.getBaseIdentifier().str()));
       });
   return (candidate ? candidate->getName() : DeclName());

tools/SourceKit/lib/SwiftLang/CodeCompletionOrganizer.cpp

@@ -544,7 +544,8 @@ void CodeCompletionOrganizer::Impl::addCompletionsWithFilter(
       match = completion->getName().startswith_lower(filterText);
     }
 
-    bool isExactMatch = match && completion->getName().equals_lower(filterText);
+    bool isExactMatch =
+        match && completion->getName().equals_insensitive(filterText);
 
     if (isExactMatch) {
       if (!exactMatch) { // first match

tools/SourceKit/tools/sourcekitd-test/sourcekitd-test.cpp

@@ -302,9 +302,9 @@ static int printDiags();
 static void getSemanticInfo(sourcekitd_variant_t Info, StringRef Filename);
 
 static Optional<int64_t> getReqOptValueAsInt(StringRef Value) {
-  if (Value.equals_lower("true"))
+  if (Value.equals_insensitive("true"))
     return 1;
-  if (Value.equals_lower("false"))
+  if (Value.equals_insensitive("false"))
     return 0;
   int64_t Ret;
   if (Value.find_first_not_of("-0123456789") != StringRef::npos ||