Fix NVPTX/call-with-alloca-buffer.ll after r276777.
Fix NVPTX/call-with-alloca-buffer.ll after r276777.

r276777 makes InstSimplify stronger, letting it see through some
unnecessary addrspace casts.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@276786 91177308-0d34-0410-b5e6-96231b3b80d8

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