[QC][Vulkan][Clang] `Feature/HLSLLib/mul.int64.test` fails on Qualcomm under Vulkan with Clang

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The test `Feature/HLSLLib/mul.int64.test` fails on Qualcomm when running under Vulkan with the Clang compiler.
Notably, the test does pass under DXC: https://github.com/llvm/offload-test-suite/actions/runs/23050379034/job/66949784913#step:12:397

Logs: https://github.com/llvm/offload-test-suite/actions/runs/23050218583/job/66949237074#step:12:481
```
FAIL: OffloadTest-clang-vk :: Feature/HLSLLib/mul.int64.test (183 of 396)
******************** TEST 'OffloadTest-clang-vk :: Feature/HLSLLib/mul.int64.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 117
c:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\split-file.exe C:\actions-runner\_work\offload-test-suite\offload-test-suite\OffloadTest\test\Feature\HLSLLib\mul.int64.test C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp
# executed command: 'c:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\split-file.exe' 'C:\actions-runner\_work\offload-test-suite\offload-test-suite\OffloadTest\test\Feature\HLSLLib\mul.int64.test' 'C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp'
# RUN: at line 118
c:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\clang-dxc.exe -spirv -fspv-target-env=vulkan1.3 -fspv-extension=DXC --dxv-path=C:/actions-runner/_work/offload-test-suite/offload-test-suite/DXC/build/bin -T cs_6_5 -Fo C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp.o C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp/source.hlsl
# executed command: 'c:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\clang-dxc.exe' -spirv -fspv-target-env=vulkan1.3 -fspv-extension=DXC --dxv-path=C:/actions-runner/_work/offload-test-suite/offload-test-suite/DXC/build/bin -T cs_6_5 -Fo 'C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp.o' 'C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp/source.hlsl'
# RUN: at line 119
c:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\offloader.exe -debug-layer C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp/pipeline.yaml C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp.o
# executed command: 'c:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\bin\offloader.exe' -debug-layer 'C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp/pipeline.yaml' 'C:\actions-runner\_work\offload-test-suite\offload-test-suite\llvm-project\build\tools\OffloadTest\test\clang-vk\Feature\HLSLLib\Output\mul.int64.test.tmp.o'
# .---command stdout------------
# | Using Vulkan API
# | Physical device created.
# | Shader module created.
# | Copy command buffer created.
# | Memory buffers created.
# | Executed copy command buffer.
# | Execute command buffer created.
# | Descriptors: { type = 7, count = 2 }
# | Descriptor pool created.
# | Binding 2 descriptors.
# | Num Descriptor sets: 1
# | Updating Descriptor [0] { 0, 0 }
# | Updating Descriptor [1] { 0, 1 }
# | WriteDescriptors: 2
# | Descriptor sets created.
# `-----------------------------
# .---command stderr------------
# | gpu-exec: error: Failed to create pipeline.
# `-----------------------------
# error: command failed with exit status: 1
```

Start with Feature/HLSLLib/mul.int64.test and reproduce the clang-vk run on Qualcomm using the commands and logs linked in the issue. Compare the failing Vulkan pipeline creation with the passing DXC run; done means the test completes successfully under Vulkan with Clang.

Written by the indexing model from the issue text.