[PATCH] fix PR17906, a bug in ArgumentPromotion

[Manman Ren]

We used to use std::map<IndicesVector, LoadInst*> for OriginalLoads, and
when we try to promote two arguments, they will both write to OriginalLoads
causing created loads for the two arguments to have the same original load.
And the same tbaa tag and alignment will be put to the created loads for
the two arguments.


The fix is to use std::map<std::pair<Argument*, IndicesVector>, LoadInst*>
for OriginalLoads, so each Argument will write to different parts of the
map.


Please review,


Thanks,

Manman
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