Shuxin Yang 408bdad5b4 Memory Dependence Analysis (not mem-dep test) take advantage of "invariant.load" metadata. ...

The "invariant.load" metadata indicates the memory unit being accessed is immutable.
A load annotated with this metadata can be moved across any store.

As I am not sure if it is legal to move such loads across barrier/fence, this
change dose not allow such transformation.

rdar://11311484

Thank Arnold for code review.

llvm-svn: 176562

2013-03-06 17:48:48 +00:00

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