[clang] [libc] [llvm] [openmp] [libc] Rework the GPU build to be a regular target (PR #81921)

[Joseph Huber via cfe-commits]

================
@@ -533,15 +542,14 @@ endfunction(add_integration_test)
 set(LIBC_HERMETIC_TEST_COMPILE_OPTIONS ${LIBC_COMPILE_OPTIONS_DEFAULT}
----------------
jhuber6 wrote:

Yeah there's a lot of logic that's moved and broken after rebasing. Trying to figure out what's changed.

https://github.com/llvm/llvm-project/pull/81921