[PATCH] ptr.annotation Intrinsic Lowering

[Zeng Bin]

Hi all,

The attached patch ignores the llvm.ptr.annotation.* intrinsic during DAG
building, specified in
http://llvm.org/docs/LangRef.html#llvm-ptr-annotation-intrinsic.
It tries to fix bug 15253.

Thank you for reviewing!
Bin
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