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[LoopVectorize] Rename pass options. NFC.

Description

[LoopVectorize] Rename pass options. NFC.

Rename:
NoUnrolling to InterleaveOnlyWhenForced
and
AlwaysVectorize to !VectorizeOnlyWhenForced

Contrary to what the name 'AlwaysVectorize' suggests, it does not
unconditionally vectorize all loops, but applies a cost model to
determine whether vectorization is profitable to all loops. Hence,
passing false will disable the cost model, except when a loop is marked
with llvm.loop.vectorize.enable. The 'OnlyWhenForced' suffix (suggested
by @hfinkel in D55716) better matches this behavior.

Similarly, 'NoUnrolling' disables the profitability cost model for
interleaving (a term to distinguish it from unrolling by the
LoopUnrollPass); rename it for consistency.

Differential Revision: https://reviews.llvm.org/D55785

Details

Committed
MeinersburDec 18 2018, 9:46 AM
Differential Revision
D55785: [LoopVectorize] Rename pass options. NFC.
Parents
rL349512: XFAIL Pair of OpenMP Tests for PowerPC LE Linux
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