[clang] [Clang] Fix name lookup for dependent bases (PR #114978)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clangd-ubuntu-tsan` running on `clangd-ubuntu-clang` while building `clang` at step 6 "test-build-clangd-clangd-index-server-clangd-in...".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/134/builds/9282

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

```
Step 6 (test-build-clangd-clangd-index-server-clangd-in...) failure: test (failure)
******************** TEST 'Clangd :: target_info.test' FAILED ********************
Exit Code: 66

Command Output (stderr):
--
RUN: at line 5: rm -rf /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir && mkdir -p /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir
+ rm -rf /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir
+ mkdir -p /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir
RUN: at line 7: echo '[{"directory": "/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir", "command": "/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir/armv7-clang -x c++ the-file.cpp -v", "file": "the-file.cpp"}]' > /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir/compile_commands.json
+ echo '[{"directory": "/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir", "command": "/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir/armv7-clang -x c++ the-file.cpp -v", "file": "the-file.cpp"}]'
RUN: at line 9: sed -e "s|INPUT_DIR|/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir|g" /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/target_info.test > /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test.1
+ sed -e 's|INPUT_DIR|/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.dir|g' /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/clang-tools-extra/clangd/test/target_info.test
RUN: at line 12: sed -E -e 's|"file://([A-Z]):/|"file:///\1:/|g' /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test.1 > /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test
+ sed -E -e 's|"file://([A-Z]):/|"file:///\1:/|g' /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test.1
RUN: at line 14: clangd -lit-test < /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test 2>&1 | /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/bin/FileCheck -strict-whitespace /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test
+ clangd -lit-test
+ /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/bin/FileCheck -strict-whitespace /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/tools/clang/tools/extra/clangd/test/Output/target_info.test.tmp.test

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/114978