[clang] [clang] Merge gtest binaries into AllClangUnitTests (PR #134196)

[Reid Kleckner via cfe-commits]

rnk wrote:

Are the `CodeGenTest.TestNonAlterTest` failures still an issue? I don't see that failure on any bots. I haven't gotten any reports.

https://github.com/llvm/llvm-project/pull/134196