use cheaper/simpler getselector call for @selector exprs.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52759 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGObjC.cpp

@@ -33,8 +33,7 @@ llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) {
   // Note that this implementation allows for non-constant strings to be passed
   // as arguments to @selector().  Currently, the only thing preventing this
   // behaviour is the type checking in the front end.
-  return CGM.getObjCRuntime()->GetSelector(Builder,
-      CGM.GetAddrOfConstantString(E->getSelector().getName()), 0);
+  return CGM.getObjCRuntime()->GetSelector(Builder, E->getSelector());
 }
 
 

lib/CodeGen/CGObjCGNU.cpp

@@ -118,10 +118,10 @@ public:
                                                 unsigned ArgC);
   virtual llvm::Value *LookupClass(llvm::IRBuilder &Builder, llvm::Value
       *ClassName);
+  virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder, Selector Sel);
   virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder,
                                    llvm::Value *SelName,
                                    llvm::Value *SelTypes);
-  llvm::Value *GetSelector(llvm::IRBuilder &Builder, Selector Sel);
   
   virtual llvm::Function *MethodPreamble(
                                          const std::string &ClassName,

lib/CodeGen/CGObjCRuntime.h

@@ -53,12 +53,13 @@ public:
   /// this compilation unit with the runtime library.
   virtual llvm::Function *ModuleInitFunction() =0;
   /// Get a selector for the specified name and type values
+  virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder, Selector Sel) = 0;
   virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder,
                                    llvm::Value *SelName,
                                    llvm::Value *SelTypes) = 0;
   /// Generate a constant string object
-  virtual llvm::Constant *GenerateConstantString(const char *String, const size_t
-      length) =0;
+  virtual llvm::Constant *GenerateConstantString(const char *String,
+                                                 const size_t Length) = 0;
   /// Generate a category.  A category contains a list of methods (and
   /// accompanying metadata) and a list of protocols.
   virtual void GenerateCategory(const char *ClassName, const char *CategoryName,