[driver] Disable the slp vectorizer at -O0, -O1, and -Oz. This mirrors the

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Committed
mcrosierApr 28 2014, 12:30 PM
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rL207432: [X86] Add more details in the comments of X86TargetLowering…
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Description

[driver] Disable the slp vectorizer at -O0, -O1, and -Oz. This mirrors the
behavior of the loop vectorizer, which is enabled at -O2, -O3, -O4, -Ofast
and -Os.
PR19568

rL207433

cfe/trunk/lib/Driver/Tools.cpp

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cfe/trunk/test/Driver/clang_f_opts.c

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