Anna Thomas 46329f6079 [ImplicitNullCheck] Handle instructions that preserve zero value ...

This is the first in a series of patches to make implicit null checks
more general. This patch identifies instructions that preserves zero
value of a register and considers that as a valid instruction to hoist
along with the faulting load. See added testcases.

Reviewed-By: reames, dantrushin

Differential Revision: https://reviews.llvm.org/D87108

2020-09-10 13:39:50 -04:00

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