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[CMake] Detect if -Wfoo is supported instead of -Wno-foo, as GCC occasionally…

Description

[CMake] Detect if -Wfoo is supported instead of -Wno-foo, as GCC occasionally silently discards unknown -Wno-foo flags.

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Committed
samsonovNov 13 2014, 1:19 PM
Parents
rL221924: [GVN] Perform Scalar PRE on gep indices that feed loads before doing Load PRE.
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