[Sema] Remove unused function getFloat128Identifier

The last use was removed by:

  commit bb1ea2d
  Author: Nemanja Ivanovic <nemanja.i.ibm@gmail.com>
  Date:   Mon May 9 08:52:33 2016 +0000

Differential Revision: https://reviews.llvm.org/D151608

clang/include/clang/Sema/Sema.h

@@ -13764,7 +13764,6 @@ class Sema final {
   Scope *CurScope;
 
   mutable IdentifierInfo *Ident_super;
-  mutable IdentifierInfo *Ident___float128;
 
   /// Nullability type specifiers.
   IdentifierInfo *Ident__Nonnull = nullptr;
@@ -13813,7 +13812,6 @@ class Sema final {
   }
 
   IdentifierInfo *getSuperIdentifier() const;
-  IdentifierInfo *getFloat128Identifier() const;
 
   ObjCContainerDecl *getObjCDeclContext() const;
 

clang/lib/Sema/Sema.cpp

@@ -219,7 +219,7 @@ Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
       ArgumentPackSubstitutionIndex(-1), CurrentInstantiationScope(nullptr),
       DisableTypoCorrection(false), TyposCorrected(0), AnalysisWarnings(*this),
       ThreadSafetyDeclCache(nullptr), VarDataSharingAttributesStack(nullptr),
-      CurScope(nullptr), Ident_super(nullptr), Ident___float128(nullptr) {
+      CurScope(nullptr), Ident_super(nullptr) {
   assert(pp.TUKind == TUKind);
   TUScope = nullptr;
   isConstantEvaluatedOverride = false;
@@ -2686,12 +2686,6 @@ IdentifierInfo *Sema::getSuperIdentifier() const {
   return Ident_super;
 }
 
-IdentifierInfo *Sema::getFloat128Identifier() const {
-  if (!Ident___float128)
-    Ident___float128 = &Context.Idents.get("__float128");
-  return Ident___float128;
-}
-
 void Sema::PushCapturedRegionScope(Scope *S, CapturedDecl *CD, RecordDecl *RD,
                                    CapturedRegionKind K,
                                    unsigned OpenMPCaptureLevel) {