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[ARM][CMSE] Add commandline option and feature macro

Description

[ARM][CMSE] Add commandline option and feature macro

Defines macro ARM_FEATURE_CMSE to 1 for v8-M targets and introduces
-mcmse option which for v8-M targets sets ARM_FEATURE_CMSE to 3.
A diagnostic is produced when the option is given on architectures
without support for Security Extensions.
Reviewed By: dmgreen, snidertm
Differential Revision: https://reviews.llvm.org/D59879

Details

Committed
javed.absarMay 21 2019, 7:21 AM
Reviewer
dmgreen
Differential Revision
D59879: [ARM][CMSE] Add commandline option and feature macro
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