[clang] [Sema] Avoid repeated hash lookups (NFC) (PR #111227)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-arm-ubuntu` running on `linaro-lldb-arm-ubuntu` while building `clang` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/18/builds/4975

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: lang/cpp/incomplete-stl-types/TestStlIncompleteTypes.py (794 of 2809)
PASS: lldb-api :: lang/cpp/incomplete-types/members/TestCppIncompleteTypeMembers.py (795 of 2809)
PASS: lldb-api :: lang/cpp/keywords_enabled/TestCppKeywordsEnabled.py (796 of 2809)
PASS: lldb-api :: lang/cpp/inlines/TestInlines.py (797 of 2809)
PASS: lldb-api :: lang/cpp/lambdas/TestLambdas.py (798 of 2809)
PASS: lldb-api :: lang/cpp/llvm-style/TestLLVMStyle.py (799 of 2809)
UNSUPPORTED: lldb-api :: lang/cpp/modules-import/TestCXXModulesImport.py (800 of 2809)
PASS: lldb-api :: lang/cpp/limit-debug-info/TestWithLimitDebugInfo.py (801 of 2809)
PASS: lldb-api :: lang/cpp/member-and-local-vars-with-same-name/TestMembersAndLocalsWithSameName.py (802 of 2809)
PASS: lldb-api :: lang/cpp/multiple-inheritance/TestCppMultipleInheritance.py (803 of 2809)
FAIL: lldb-api :: lang/c/shared_lib_stripped_symbols/TestSharedLibStrippedSymbols.py (804 of 2809)
******************** TEST 'lldb-api :: lang/c/shared_lib_stripped_symbols/TestSharedLibStrippedSymbols.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env ARCHIVER=/usr/local/bin/llvm-ar --env OBJCOPY=/usr/bin/llvm-objcopy --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --arch armv8l --build-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin/dsymutil --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/./lib /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/lang/c/shared_lib_stripped_symbols -p TestSharedLibStrippedSymbols.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 20.0.0git (https://github.com/llvm/llvm-project.git revision e8f01b0557354a28d17bfe618df5e257ec3e982a)
  clang revision e8f01b0557354a28d17bfe618df5e257ec3e982a
  llvm revision e8f01b0557354a28d17bfe618df5e257ec3e982a
Skipping the following test categories: ['libc++', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_expr_dsym (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase) (test case does not fall in any category of interest for this run) 
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_expr_dwarf (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase)
FAIL: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_expr_dwo (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase)
UNSUPPORTED: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_frame_variable_dsym (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase) (test case does not fall in any category of interest for this run) 
XFAIL: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_frame_variable_dwarf (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase)
XFAIL: LLDB (/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/bin/clang-arm) :: test_frame_variable_dwo (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase)
======================================================================
FAIL: test_expr_dwo (TestSharedLibStrippedSymbols.SharedLibStrippedTestCase)
   Test that types work when defined in a shared library and forwa/d-declared in the main executable
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1769, in test_method
    return attrvalue(self)
  File "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/test/API/lang/c/shared_lib_stripped_symbols/TestSharedLibStrippedSymbols.py", line 24, in test_expr
    self.expect(
  File "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 2370, in expect
    self.runCmd(
  File "/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/lldbtest.py", line 1000, in runCmd
    self.assertTrue(self.res.Succeeded(), msg + output)
AssertionError: False is not true : Variable(s) displayed correctly
Error output:

```

</details>

https://github.com/llvm/llvm-project/pull/111227