[clang] [Clang][ASTMatcher] Add a matcher for the name of a DependentScopeDeclRefExpr (PR #121656)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-multistage` running on `ppc64le-clang-multistage-test` while building `clang` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/76/builds/5845

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-mc -triple=x86_64-unknown-linux -position-independent      -filetype=obj -o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.1.o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s
+ /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-mc -triple=x86_64-unknown-linux -position-independent -filetype=obj -o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.1.o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s
RUN: at line 4: /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-jitlink -noexec /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.1.o
+ /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-jitlink -noexec /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.1.o
RUN: at line 7: /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-mc -triple=x86_64-unknown-linux -position-independent --defsym=OVERFLOW=1      -filetype=obj -o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.2.o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s
+ /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-mc -triple=x86_64-unknown-linux -position-independent --defsym=OVERFLOW=1 -filetype=obj -o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.2.o /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s
RUN: at line 9: not /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-jitlink -noexec /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.2.o 2>&1 | /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/FileCheck /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s
+ not /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/llvm-jitlink -noexec /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/test/ExecutionEngine/JITLink/x86-64/Output/ELF_R_X86_64_SIZE.s.tmp.2.o
+ /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/bin/FileCheck /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-multistage-test/clang-ppc64le-multistage/llvm/llvm/test/ExecutionEngine/JITLink/x86-64/ELF_R_X86_64_SIZE.s

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/121656