John Brawn 4b476488ba [CGP] Fix handling of null pointer values in optimizeMemoryInst ...

The current way that trivial addressing modes are detected incorrectly thinks
that null pointers are non-trivial, leading to an infinite loop where we keep
duplicating the same select. Fix this by aware of null when deciding if an
addressing mode is trivial.

Differential Revision: https://reviews.llvm.org/D40447

llvm-svn: 319019

2017-11-27 11:29:15 +00:00

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