Replace a couple of Builder.CreateICmpEQ with Builder.CreateIsNull. No functionality change.

llvm-svn: 129261
diff --git a/clang/lib/CodeGen/CGClass.cpp b/clang/lib/CodeGen/CGClass.cpp
index ce41e84..2789bb2 100644
--- a/clang/lib/CodeGen/CGClass.cpp
+++ b/clang/lib/CodeGen/CGClass.cpp
@@ -172,9 +172,7 @@
     CastNotNull = createBasicBlock("cast.notnull");
     CastEnd = createBasicBlock("cast.end");
     
-    llvm::Value *IsNull = 
-      Builder.CreateICmpEQ(Value,
-                           llvm::Constant::getNullValue(Value->getType()));
+    llvm::Value *IsNull = Builder.CreateIsNull(Value);
     Builder.CreateCondBr(IsNull, CastNull, CastNotNull);
     EmitBlock(CastNotNull);
   }
@@ -246,9 +244,7 @@
     CastNotNull = createBasicBlock("cast.notnull");
     CastEnd = createBasicBlock("cast.end");
     
-    llvm::Value *IsNull = 
-    Builder.CreateICmpEQ(Value,
-                         llvm::Constant::getNullValue(Value->getType()));
+    llvm::Value *IsNull = Builder.CreateIsNull(Value);
     Builder.CreateCondBr(IsNull, CastNull, CastNotNull);
     EmitBlock(CastNotNull);
   }