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[clang][RISCV][test] Add more tests of the -mabi and -march options

Authored by benshi001 on Jun 9 2021, 6:14 PM.

Description

[clang][RISCV][test] Add more tests of the -mabi and -march options

  1. There is no tests for mabi=ilp32e, and my patch covers that.
  2. The tests in riscv-abi.c will show default ABI changes for special archs in the future, especially the arch with the F but without the D extension.
  3. The tests in riscv-arch.c will show default arch changes for abi=ilp32, which is rv32imacfd currently, but it is better to be rv32imac. And it is also better for abi=ilp32f defaults to arch=imacf.

Reviewed By: MaskRay, luismarques

Differential Revision: https://reviews.llvm.org/D103878