Add ObjC constant string support for NeXT.

Changed CGObjCRuntime::GenerateConstantString interface to take
       std::string instead of char* and size.

Change ObjC functions which call on GenerateConstantString to bitcast
       result to appropriate type.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54659 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index 5865f21..3d530e8 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -61,8 +61,10 @@
     return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
   }
   llvm::Constant *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
-    return CGM.getObjCRuntime().GenerateConstantString(
-        E->getString()->getStrData(), E->getString()->getByteLength());
+    std::string S(E->getString()->getStrData(), 
+                  E->getString()->getByteLength());
+    llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(S);
+    return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
   }
   
   llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {