[PATCH] D133329: [Driver] Add --gcc-install-dir=

[Fangrui Song via Phabricator via cfe-commits]

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This option specifies a GCC installation directory such as
/usr/lib/gcc/x86_64-linux-gnu/12, /usr/lib/gcc/x86_64-gentoo-linux-musl/11.2.0 .

It is intended to replace --gcc-toolchain=, which specifies a directory where
`lib/gcc{,-cross}` can be found. In most cases the user does not specify
--gcc-toolchain=. When --gcc-toolchain= is specified, the selected
`lib/gcc/$triple/$version` installation may not be desired.

D25661 <https://reviews.llvm.org/D25661> added gcc-config detection for Gentoo: `ScanGentooConfigs`.
The implementation may be simplified by using --gcc-install-dir=.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133329

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/test/Driver/gcc-install-dir.cpp

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