Deduplicate strings in the _hilog_ section · Pull Request !631 · OpenHarmony/third_party_llvm-project

### Issue
https://gitee.com/openharmony/third_party_llvm-project/issues/IB8QCC

### Reason (Purpose, Solved Problem)

###     Description

This patch introduces deduplication for strings in the _hilog_ section by enabling the UnnamedAddr property for global variables in this section. Additionally, the _hilog_ section is now categorized as SectionKind::getMergeable1ByteCString() to allow merging of identical strings at the ELF level.

Key Changes:
clang/lib/CodeGen/CodeGenModule.cpp

Updated setNonAliasAttributes to set the UnnamedAddr::Global property for global variables in the _hilog_ section.
llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp

Modified getELFKindForNamedSection to classify _hilog_ as a mergeable 1-byte C string section (SectionKind::getMergeable1ByteCString).
These changes ensure that strings in the _hilog_ section are deduplicated at the ELF level, reducing redundant storage and improving runtime efficiency.

### Test (Local test)

### Need to cherry-pick to release (eg：monthly_20221018, OpenHarmony-3.2-Beta5 ...) branch？

- [ ] yes，branch list:
- [x] no

why:

###  Compatibility impact assessment, please indicate (Y/N)

类型	指派人员	状态
审查		进行中 (0/1)
测试		进行中 (0/1)

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