[DevSAN] Make device sanitizer kernel metadata has a unique id

[zhaomaosu]

We decorated kernel metadata global as a device global, if we don't give a unique id to it, device sanitizer will not work in shared libraries.

[Copilot]

Pull Request Overview

This PR ensures that kernel metadata for device sanitizers receive a unique identifier by computing an MD5 hash over aggregated kernel names, which is then appended to a given prefix. The changes update LLVM test expectations and modify ThreadSanitizer, MemorySanitizer, and AddressSanitizer instrumentation passes to leverage the new unique-id generation mechanism.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
llvm/test/Instrumentation/ThreadSanitizer/SPIRV/kernel_metadata.ll	Updated unique-id check with new MD5-based value
llvm/test/Instrumentation/MemorySanitizer/SPIRV/instrument_global_address_space.ll	Updated unique-id check with new MD5-based value
llvm/test/Instrumentation/AddressSanitizer/SPIRV/extend_launch_info_arg.ll	Updated unique-id check with new MD5-based value
llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp	Introduced aggregation of kernel names and integrated computeKernelMetadataUniqueId
llvm/lib/Transforms/Instrumentation/SPIRVSanitizerCommonUtils.cpp	Added computeKernelMetadataUniqueId helper using MD5 for unique-id generation
llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp	Added similar MD5-based unique-id generation for metadata
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp	Added similar MD5-based unique-id generation for metadata
llvm/include/llvm/Transforms/Instrumentation/SPIRVSanitizerCommonUtils.h	Declared the computeKernelMetadataUniqueId function

Comments suppressed due to low confidence (2)

llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp:509

• [nitpick] Consider renaming 'KernelNamesBytes' to a more descriptive name like 'AggregatedKernelNamesBytes' to clarify that it aggregates bytes from multiple kernel names.

SmallVector<uint8_t, 256> KernelNamesBytes;

llvm/lib/Transforms/Instrumentation/SPIRVSanitizerCommonUtils.cpp:63

• Consider adding a docstring for 'computeKernelMetadataUniqueId' that explains its purpose, the use of an MD5 hash for generating a unique id, and how the aggregated kernel name bytes contribute to this identifier.

SmallString<128> computeKernelMetadataUniqueId(StringRef Prefix, SmallVectorImpl<uint8_t> &KernelNamesBytes) {