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[OpenCL] Add extension Sema check for subgroup builtins

Description

[OpenCL] Add extension Sema check for subgroup builtins

Check the subgroup extension is enabled, before doing other Sema checks.

Details

Committed
joeyJul 31 2017, 8:15 AM
Parents
rL309566: [SLP] Initial rework for min/max horizontal reduction vectorization, NFC.
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