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[x86] add tests to show potential opt-out of ftrunc optimization; NFC

Description

[x86] add tests to show potential opt-out of ftrunc optimization; NFC

This is another preliminary step for disabling this transform as
discussed in the post-commit thread for:
rL330437
I'm using one of the names suggested there for the attribute, but
we can fix that up as needed once the clang side of this is sorted
out.

Details

Committed
spatelApr 26 2018, 8:36 AM
Parents
rL330949: [RISCV] Implement isLoadFromStackSlot and isStoreToStackSlot
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