[ClangLinkerWrapper] Reintroduce missing upstream commits that remove in-house LTO in clang-linker-wrapper (#17323)

A couple of upstream commits were not merged due to merge conflicts.
This PR reintroduces the following upstream commits:


ccd73ee

4a96081
Also, This PR restores missing changes from upstream commit
aae059e1389bebe86ceb3aea159d95ca6d0823ea](f2f1a14)

Thanks

---------

Signed-off-by: Arvind Sudarsanam <[email protected]>
Co-authored-by: Joseph Huber <[email protected]>
Co-authored-by: Kazu Hirata <[email protected]>

Author: 3 people

clang/test/Driver/linker-wrapper-libs.c

@@ -161,7 +161,7 @@ int bar() { return weak; }
 // RUN:   --linker-path=/usr/bin/ld %t.o %t.a %t.a -o a.out 2>&1 \
 // RUN: | FileCheck %s --check-prefix=LIBRARY-GLOBAL-DEFINED
 
-// LIBRARY-GLOBAL-DEFINED: clang{{.*}} -o {{.*}}.img --target=nvptx64-nvidia-cuda -march=sm_70 {{.*}} {{.*}}.o
+// LIBRARY-GLOBAL-DEFINED: clang{{.*}} -o {{.*}}.img --target=nvptx64-nvidia-cuda -march=sm_70 {{.*}}.o {{.*}}.o
 // LIBRARY-GLOBAL-DEFINED-NOT: {{.*}}gfx1030{{.*}}.o
 // LIBRARY-GLOBAL-DEFINED: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx1030 {{.*}}.o {{.*}}.o
 
@@ -185,7 +185,7 @@ int bar() { return weak; }
 // RUN:   --linker-path=/usr/bin/ld %t.o --whole-archive %t.a -o a.out 2>&1 \
 // RUN: | FileCheck %s --check-prefix=LIBRARY-WHOLE-ARCHIVE
 
-// LIBRARY-WHOLE-ARCHIVE: clang{{.*}} -o {{.*}}.img --target=nvptx64-nvidia-cuda -march=sm_70 {{.*}} {{.*}}.o
+// LIBRARY-WHOLE-ARCHIVE: clang{{.*}} -o {{.*}}.img --target=nvptx64-nvidia-cuda -march=sm_70 {{.*}}.o {{.*}}.o
 // LIBRARY-WHOLE-ARCHIVE: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx1030 {{.*}}.o {{.*}}.o
 // LIBRARY-WHOLE-ARCHIVE: clang{{.*}} -o {{.*}}.img --target=nvptx64-nvidia-cuda -march=sm_52 {{.*}}.o
 // LIBRARY-WHOLE-ARCHIVE: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx90a {{.*}}.o

clang/test/Driver/linker-wrapper.c

@@ -48,7 +48,7 @@ __attribute__((visibility("protected"), used)) int x;
 // RUN: clang-linker-wrapper --host-triple=x86_64-unknown-linux-gnu --dry-run --save-temps -O2 \
 // RUN:   --linker-path=/usr/bin/ld %t.o -o a.out 2>&1 | FileCheck %s --check-prefix=AMDGPU-LTO-TEMPS
 
-// AMDGPU-LTO-TEMPS: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx1030 -O2 -flto -Wl,--no-undefined {{.*}} -save-temps
+// AMDGPU-LTO-TEMPS: clang{{.*}} -o {{.*}}.img --target=amdgcn-amd-amdhsa -mcpu=gfx1030 -O2 -flto -Wl,--no-undefined {{.*}}.o -save-temps
 
 // RUN: clang-offload-packager -o %t.out \
 // RUN:   --image=file=%t.elf.o,kind=openmp,triple=x86_64-unknown-linux-gnu \