[PATCH] D59298: [RISCV] Pass -target-abi to -cc1as

[Roger Ferrer Ibanez via Phabricator via cfe-commits]

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The RISC-V assembler needs the target ABI because it defines a flag of the the ELF file, as described in [1].

Make `clang` (the driver) to pass the target ABI to `-cc1as` in exactly the same way it does for `-cc1`.

Currently `-cc1as` knows about `-target-abi` but is not handling it. Handle it and pass it to the MC layer via MCTargetOptions.

[1] https://github.com/riscv/riscv-elf-psabi-doc/blob/master/riscv-elf.md#file-header


Repository:
  rC Clang

https://reviews.llvm.org/D59298

Files:
  lib/Driver/ToolChains/Clang.cpp
  lib/Driver/ToolChains/Clang.h
  test/Driver/riscv-abi.c
  tools/driver/cc1as_main.cpp

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