[PATCH] D45284: [RISCV] More validations on the input value of -march=

[Ana Pazos via Phabricator via cfe-commits]

apazos created this revision.
apazos added reviewers: asb, kito-cheng.
Herald added subscribers: shiva0217, niosHD, sabuasal, jordy.potman.lists, simoncook, johnrusso, rbar.

- Updated diagnostic messages for invalid/unsupported  march combinations.
- Parsing X, SX and S extensions.


https://reviews.llvm.org/D45284

Files:
  include/clang/Basic/DiagnosticDriverKinds.td
  lib/Driver/ToolChains/Arch/RISCV.cpp
  test/Driver/riscv-arch.c

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