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[DAGCombiner] limit ftrunc optimizations with function attribute

Description

[DAGCombiner] limit ftrunc optimizations with function attribute

As noted, the attribute name is subject to change once we have
the clang side implemented, but it's clear that we need some
kind of attribute-based predication here based on the discussion
for:
rL330437

Details

Committed
spatelApr 26 2018, 9:04 AM
Parents
rL330950: [x86] add tests to show potential opt-out of ftrunc optimization; NFC
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