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Commit 893e5bc7 authored by Alex Bradbury's avatar Alex Bradbury
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[RISCV] Support .option push and .option pop 

This adds support in the RISCVAsmParser the storing of Subtarget feature bits to a stack so that they can be pushed/popped to enable/disable multiple features at once.

Differential Revision: https://reviews.llvm.org/D46424
Patch by Lewis Revill.

llvm-svn: 347774
parent 8d63aed4
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