[PATCH] Tweak EarlyCSE to recognize series of dead stores

[Philip Reames]

Hi hfinkel, nlewycky, craig.topper,

EarlyCSE is giving up on the current instruction immediately when it recognizes that the current instruction makes a previous store trivially dead.  There's no reason to do this.  Once the previous store has been deleted, it's perfectly legal to remember the value of the current store (for value forwarding) and the fact the store occurred (it could be dead too!).

http://reviews.llvm.org/D6301

Files:
  lib/Transforms/Scalar/EarlyCSE.cpp
  test/Transforms/EarlyCSE/basic.ll
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