[Comgr] Add lit test for unbundling compressed amdgcnspirv bundles

amd/comgr/test-lit/spirv-tests/unbundle-compressed.hip

@@ -0,0 +1,38 @@
+// REQUIRES: comgr-has-spirv-translator
+
+// COM: Build a compressed bitcode bundle for amdgcnspirv.
+// RUN: %clang -c -x hip --offload-arch=amdgcnspirv \
+// RUN:    -nogpulib -nogpuinc -emit-llvm \
+// RUN:    --gpu-bundle-output --offload-device-only \
+// RUN:    --offload-compress \
+// RUN:    %s -o %t.compressed-bundle.bc
+
+// COM: Sanity-check that the bundle is actually compressed (CCOB magic) and
+// COM: that the expected entry ID is present.
+// RUN: od -An -c -N 4 %t.compressed-bundle.bc | %FileCheck --check-prefix=MAGIC %s
+// RUN: clang-offload-bundler --type=bc --input=%t.compressed-bundle.bc --list \
+// RUN:   | %FileCheck --check-prefix=ENTRY %s
+
+// MAGIC: C C O B
+// ENTRY: hip-spirv64-amd-amdhsa--amdgcnspirv
+
+// COM: Extract the amdgcnspirv entry through Comgr. Output is a SPIR-V module
+// COM: (not LLVM bitcode), so verify the SPIR-V magic word 0x07230203.
+// RUN: unbundle %t.compressed-bundle.bc \
+// RUN:   hip-spirv64-amd-amdhsa--amdgcnspirv %t.amdgcnspirv.spv
+// RUN: od -An -tx4 -N 4 %t.amdgcnspirv.spv | %FileCheck --check-prefix=SPV %s
+
+// SPV: 07230203
+
+// COM: Translate the unbundled SPIR-V back to LLVM IR via Comgr's translator
+// COM: and verify it matches the original device source.
+// RUN: spirv-translator %t.amdgcnspirv.spv -o %t.translated.bc
+// RUN: %llvm-dis %t.translated.bc -o - | %FileCheck --check-prefix=BC %s
+
+// BC: target triple = "amdgcn-amd-amdhsa"
+// BC: define {{.*}} @_Z9add_valuePfS_S_
+
+__attribute__((device))
+void add_value(float* a, float* b, float* res) {
+    *res = *a + *b;
+}