Prior to D120727, the libcxx build was responsible for copying libcxxabi
headers into the right location, both in the build and install trees,
but now it's the responsibility of the libcxxabi build. While the build
already did the right thing for the install tree, it wouldn't copy
headers into the build tree, resulting in errors when trying to use the
just built toolchain as is the case in the runtimes build when building
compiler-rt runtimes.
Differential Revision: https://reviews.llvm.org/D125597
libc++abi should be responsible for installing its own headers, it
doesn't make sense for libc++ to be responsible for it.
Differential Revision: https://reviews.llvm.org/D101458
Petr Hosek