libclc install fails with `cannot find "/build/source/libclc/pitcairn-amdgcn--.bc"`

[sylvestre]

-- Installing: /build/source/debian/tmp/usr/include/clc/as_type.h
-- Installing: /build/source/debian/tmp/usr/lib/clc/tahiti-amdgcn--.bc
CMake Error at cmake_install.cmake:58 (file):
  file INSTALL cannot find "/build/source/libclc/pitcairn-amdgcn--.bc": No
  such file or directory.


FAILED: CMakeFiles/install.util
cd /build/source/libclc/build && /usr/bin/cmake -P cmake_install.cmake
ninja: build stopped: subcommand failed.
make[1]: *** [debian/rules:1274: override_dh_auto_install] Error 1

regression range:
469ac11..5cd6e21

Log: https://llvm-jenkins.debian.net/job/llvm-toolchain-mantic-binaries/architecture=arm64,distribution=mantic,label=arm64/775/consoleFull

[sylvestre]

@frasercrmck can it be caused by PR #115885 ?

[mgorny]

Yes, it is. Just bisected it.

[frasercrmck]

Ach, thanks for spotting and reverting that! Relanded in #116025.