[lld] [lld-macho] Implement symbol string deduplication (PR #123874)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-hip-vega20` running on `hip-vega20-0` while building `lld` at step 3 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/123/builds/12286

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 3 (annotate) failure: '../llvm-zorg/zorg/buildbot/builders/annotated/hip-build.sh --jobs=' (failure)
...
+ HERE=../llvm-zorg/zorg/buildbot/builders/annotated
+ . ../llvm-zorg/zorg/buildbot/builders/annotated/buildbot-helper.sh
+ set -eu
+ halt_on_failure
+ echo @@@HALT_ON_FAILURE@@@
@@@HALT_ON_FAILURE@@@
+ setup_env
+ build_step 'Setting up the buildbot'
+ echo '@@@BUILD_STEP Setting up the buildbot@@@'
+ BUILDBOT_ROOT=/home/botworker/bbot/clang-hip-vega20
@@@BUILD_STEP Setting up the buildbot@@@
++ whoami
+ BUILDBOT_SLAVENAME=botworker
+ AMDGPU_ARCHS='gfx908;gfx90a;gfx1030;gfx1100'
+ EXTERNAL_DIR=/opt/botworker/llvm/External
+ BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20
+ DESTDIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/install
+ LLVM_ROOT=/home/botworker/bbot/clang-hip-vega20/llvm-project
+ LLVM_REVISION=c676104875f34a87051b446469cc395932bc1f13
+ LLVM_BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/llvm
+ TESTSUITE_ROOT=/home/botworker/bbot/clang-hip-vega20/llvm-test-suite
+ TEST_BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/test-suite-build
+ NINJAOPT=
+ echo BUILDBOT_ROOT=/home/botworker/bbot/clang-hip-vega20
+ echo BUILDBOT_SLAVENAME=botworker
+ echo 'AMDGPU_ARCHS=gfx908;gfx90a;gfx1030;gfx1100'
+ echo LLVM_ROOT=/home/botworker/bbot/clang-hip-vega20/llvm-project
BUILDBOT_ROOT=/home/botworker/bbot/clang-hip-vega20
BUILDBOT_SLAVENAME=botworker
AMDGPU_ARCHS=gfx908;gfx90a;gfx1030;gfx1100
LLVM_ROOT=/home/botworker/bbot/clang-hip-vega20/llvm-project
TESTSUITE_ROOT=/home/botworker/bbot/clang-hip-vega20/llvm-test-suite
EXTERNAL_DIR=/opt/botworker/llvm/External
+ echo TESTSUITE_ROOT=/home/botworker/bbot/clang-hip-vega20/llvm-test-suite
+ echo EXTERNAL_DIR=/opt/botworker/llvm/External
+ echo BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20
+ echo DESTDIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/install
+ echo LLVM_BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/llvm
+ echo TEST_BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/test-suite-build
BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20
DESTDIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/install
LLVM_BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/llvm
TEST_BUILD_DIR=/home/botworker/bbot/clang-hip-vega20/botworker/clang-hip-vega20/test-suite-build
+ update_llvm
+ '[' '!' -d /home/botworker/bbot/clang-hip-vega20/llvm-project ']'
+ build_step 'Updating llvm-project repo'
+ echo '@@@BUILD_STEP Updating llvm-project repo@@@'
+ git -C /home/botworker/bbot/clang-hip-vega20/llvm-project fetch origin
@@@BUILD_STEP Updating llvm-project repo@@@
fatal: error reading section header 'acknowledgments'
Step 5 (Updating llvm-project repo) failure: Updating llvm-project repo (failure)
@@@BUILD_STEP Updating llvm-project repo@@@
fatal: error reading section header 'acknowledgments'
program finished with exit code 128
elapsedTime=328.518049

```

</details>

https://github.com/llvm/llvm-project/pull/123874