[clang] Revert "[Clang] Set default LTO mode for AMDGCN/SPIR-V targets to full" (PR #202714)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

> I'm not seeing any pull requests with the fix.

Turn this PR into this and tell me if it works. The reason this happened is because I made the `default bitcode` behavior only apply to the GPU architectures so this becomes `.s` now, which is strictly more correct.
```diff
diff --git a/flang/test/Driver/omp-driver-offload.f90 b/flang/test/Driver/omp-driver-offload.f90
index a4184f11bf3b..638c82c2682b 100644
--- a/flang/test/Driver/omp-driver-offload.f90
+++ b/flang/test/Driver/omp-driver-offload.f90
@@ -61,7 +61,7 @@
 ! OPENMP-OFFLOAD-ARGS-SAME:  "-fopenmp"
 ! OPENMP-OFFLOAD-ARGS-SAME:  "-fopenmp-host-ir-file-path" "{{.*}}.bc" "-fopenmp-is-target-device"
 ! OPENMP-OFFLOAD-ARGS-SAME:  {{.*}}.f90"
-! OPENMP-OFFLOAD-ARGS: "{{[^"]*}}llvm-offload-binary{{.*}}" {{.*}} "--image=file={{.*}}.bc,triple=amdgcn-amd-amdhsa,arch=gfx90a,kind=openmp"
+! OPENMP-OFFLOAD-ARGS: "{{[^"]*}}llvm-offload-binary{{.*}}" {{.*}} "--image=file={{.*}}.s,triple=amdgcn-amd-amdhsa,arch=gfx90a,kind=openmp"
 ! OPENMP-OFFLOAD-ARGS-NEXT: "{{[^"]*}}flang" "-fc1" "-triple" "aarch64-unknown-linux-gnu"
 ! OPENMP-OFFLOAD-ARGS-SAME:  "-fopenmp"
 ! OPENMP-OFFLOAD-ARGS-SAME:  "-fembed-offload-object={{.*}}.out" {{.*}}.bc"

```

https://github.com/llvm/llvm-project/pull/202714