[PCH] Use DenseMap instead of std::map to keep track of SwitchCases.

Part of rdar://11353109.

llvm-svn: 156185

Author: akyrtzi

clang/include/clang/Serialization/ASTReader.h

@@ -591,13 +591,14 @@ class ASTReader
   /// indicates how many separate module file load operations have occurred.
   unsigned CurrentGeneration;
 
+  typedef llvm::DenseMap<unsigned, SwitchCase *> SwitchCaseMapTy;
   /// \brief Mapping from switch-case IDs in the chain to switch-case statements
   ///
   /// Statements usually don't have IDs, but switch cases need them, so that the
   /// switch statement can refer to them.
-  std::map<unsigned, SwitchCase *> SwitchCaseStmts;
+  SwitchCaseMapTy SwitchCaseStmts;
 
-  std::map<unsigned, SwitchCase *> *CurrSwitchCaseStmts;
+  SwitchCaseMapTy *CurrSwitchCaseStmts;
 
   /// \brief The number of stat() calls that hit/missed the stat
   /// cache.

clang/include/clang/Serialization/ASTWriter.h

@@ -337,7 +337,7 @@ class ASTWriter : public ASTDeserializationListener,
   SmallVector<Stmt *, 16> *CollectedStmts;
 
   /// \brief Mapping from SwitchCase statements to IDs.
-  std::map<SwitchCase *, unsigned> SwitchCaseIDs;
+  llvm::DenseMap<SwitchCase *, unsigned> SwitchCaseIDs;
 
   /// \brief The number of statements written to the AST file.
   unsigned NumStatements;

clang/lib/Serialization/ASTReaderDecl.cpp

@@ -631,8 +631,8 @@ void ASTDeclReader::VisitObjCMethodDecl(ObjCMethodDecl *MD) {
     // In practice, this won't be executed (since method definitions
     // don't occur in header files).
     // Switch case IDs for this method body.
-    std::map<unsigned, SwitchCase *> SwitchCaseStmtsForObjCMethod;
-    SaveAndRestore<std::map<unsigned, SwitchCase *> *>
+    ASTReader::SwitchCaseMapTy SwitchCaseStmtsForObjCMethod;
+    SaveAndRestore<ASTReader::SwitchCaseMapTy *>
       SCFOM(Reader.CurrSwitchCaseStmts, &SwitchCaseStmtsForObjCMethod);
     MD->setBody(Reader.ReadStmt(F));
     MD->setSelfDecl(ReadDeclAs<ImplicitParamDecl>(Record, Idx));