[PATCH] - Remove llvm.ptr.annotation intrinsic prior to instruction selection

[Mark Hahnenberg]

This is a fix for http://llvm.org/bugs/show_bug.cgi?id=15253.

According to http://llvm.org/docs/LangRef.html#llvm-ptr-annotation-intrinsic,
the llvm.ptr.annotation intrinsic has the same semantics (or lack
thereof) during code generation and instruction lowering as the
llvm.var.annotation intrinsic, so we can remove them like we do the
llvm.var.annotation intrinsic in the SelectionDAGBuilder and during
the IntrinsicLowering phase.
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