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[runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and…

Authored by phosek on May 22 2019, 2:08 PM.

Description

[runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and include/c++

This change is a consequence of the discussion in "RFC: Place libs in
Clang-dedicated directories", specifically the suggestion that
libunwind, libc++abi and libc++ shouldn't be using Clang resource
directory. Tools like clangd make this assumption, but this is
currently not true for the LLVM_ENABLE_PER_TARGET_RUNTIME_DIR build.
This change addresses that by moving the output of these libraries to
lib/$target/c++ and include/c++ directories, leaving resource directory
only for compiler-rt runtimes and Clang builtin headers.

Differential Revision: https://reviews.llvm.org/D59168

llvm-svn: 361432