[PATCH] Fix bug in load PRE in GVN.cpp

[Akira Hatanaka]

This patch fixes GVN::AnalyzeLoadAvailability to pass the phi-translated
pointer address of the load instruction that is processed instead of the
untranslated address to AnalyzeLoadFromClobberingLoad.

Without the fix, GVN::AnalyzeLoadAvailability incorrectly determines a load
value is available or unavailable in a basic block, which causes load-PRE
to incorrectly determine a load is partially redundant when it isn't (see
first function in test case) or it isn't partially redundant when it is
(second function in test case).

I tested this patch running the test suite and didn't see any failing tests.

<rdar://problem/16638765>.

Please review.
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