[PATCH] Update InstCombine to transform aggregate loads into scalar loads.

[Amaury SECHET]

================
Comment at: lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp:317
@@ -320,1 +316,3 @@
+static LoadInst *combineLoadToNewValue(InstCombiner &IC, LoadInst &LI, Value *V,
+                                       Type *NewTy, const Twine& Suffix = "") {
   SmallVector<std::pair<unsigned, MDNode *>, 8> MD;
----------------
joker.eph wrote:
> Is there an invariant between V and NewTy here?
> Should we add:
> 
> ```
> assert((V->getType() == NewTy->getPointerTo(LI.getPointerAddressSpace())) && "V type mismatches NewTy");
> ```
No, but they should be the same size. Adding this invariant.

http://reviews.llvm.org/D8339

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