Fix problems in "[OpenCL] Enabling the usage of CLK_NULL_QUEUE as compare operand."

Summary: Fixed warnings in commit: https://reviews.llvm.org/rL290171

Reviewers: djasper, Anastasia

Subscribers: yaxunl, cfe-commits, bader

Differential Revision: https://reviews.llvm.org/D27981

llvm-svn: 290431
diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index 35148be..0092447 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -751,6 +751,7 @@
   case CK_CopyAndAutoreleaseBlockObject:
   case CK_BuiltinFnToFnPtr:
   case CK_ZeroToOCLEvent:
+  case CK_ZeroToOCLQueue:
   case CK_AddressSpaceConversion:
   case CK_IntToOCLSampler:
     llvm_unreachable("cast kind invalid for aggregate types");