[PATCH] D101331: hurd: Detect libstdc++ include paths on Debian Hurd i386

[Samuel Thibault via Phabricator via cfe-commits]

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This is a follow-up of e92d2b80c6c9 <https://reviews.llvm.org/rGe92d2b80c6c913b5c506df06a913a2ecbf761617> ("[Driver] Detect libstdc++ include
paths for native gcc (-m32 and -m64) on Debian i386") for the Debian Hurd
case, which has the same multiarch name reduction from i686 to i386.
i386-linux-gnu is actually Linux-only, so this moves the code of that commit
to Linux.cpp, and adds the same to Hurd.cpp


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101331

Files:
  clang/lib/Driver/ToolChains/Gnu.cpp
  clang/lib/Driver/ToolChains/Gnu.h
  clang/lib/Driver/ToolChains/Hurd.cpp
  clang/lib/Driver/ToolChains/Hurd.h
  clang/lib/Driver/ToolChains/Linux.cpp
  clang/test/Driver/Inputs/basic_hurd_tree/usr/include/c++/4.6.0/.keep
  clang/test/Driver/Inputs/basic_hurd_tree/usr/include/i386-gnu/c++/4.6.0/.keep
  clang/test/Driver/hurd.cpp

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