[X86][SandyBridge] SBWriteResPair +5cy Memory Folds
As mentioned on D44647, this patch increases the default memory latency to +5cy , which more closely matches what most custom cases are doing for reg-mem instructions.
I've bumped LoadLatency, ReadAfterLd and WriteLoad values to 5cy to be consistent.
As Sandy Bridge is currently our default generic model, this affects a lot of scheduling tests...
Differential Revision: https://reviews.llvm.org/D44654
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329388
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