Change Details

For particular subtargets setting `isSpeculativeExecutionForbidden()` to true prevents SimplePRE optimization of MIR code.

For particular subtargets setting `isSpeculativeExecutionForbidden()` to true prevents MIR code from SimplePRE optimization.

For particular subtargets setting `isSpeculativeExecutionForbidden()` to true prevents MIR code from SimplePRE optimization of MIR code.

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