[PATCH] D150537: [Clang][LoongArch] Pass the -mabi and -target-abi options to as and cc1as respectively

[Lu Weining via Phabricator via cfe-commits]

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This change is necessary to set correct EFlags according to the
options (-m*-float and -mabi=) passed to clang when input is assembly.

Note: `-mabi=` is not documented by `as`.

  $ as --version
  GNU assembler (GNU Binutils) 2.40.50.20230316
  ...
  $ as --target-help
  LARCH options:

But we can see gcc invokes `as` and passes the `-mabi=` option when compiling C or assembly.

  $ gcc -c a.c -v 2>&1 -msoft-float | grep "as -v"
   as -v -mabi=lp64s -o a.o /tmp/ccFrxzZi.s
  $ gcc -c a.s -v 2>&1 -msoft-float | grep "as -v"
   as -v -mabi=lp64s -o a.o a.s


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150537

Files:
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Driver/ToolChains/Clang.h
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/test/Driver/loongarch-as.s
  clang/test/Driver/loongarch-ias.s

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