[ARM] Implement ISB memory barrier intrinsic

Description

[ARM] Implement ISB memory barrier intrinsic

Adds support for __builtin_arm_isb. Also corrects DSB and ISB instructions
modelling by adding has-side-effects property.

Details

Committed
kongyiJul 3 2014, 9:00 AM
Parents
rL212275: bug fix for PR20020: anti-dependency-breaker causes miscompilation
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