Elena Demikhovsky 558bab1214 Optimized loading (zextload) of i1 value from memory.
This patch is a partial revert of https://llvm.org/svn/llvm-project/llvm/trunk@237793.
Extra "and" causes performance degradation.

We assume that i1 is stored in zero-extended form. And store operation is responsible for zeroing upper bits.

Differential Revision: http://reviews.llvm.org/D17541



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261828 91177308-0d34-0410-b5e6-96231b3b80d8
2016-02-25 07:05:12 +00:00
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