[clang] [clang] Treat pack-index-specifiers as non-deduced contexts (PR #232883)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `clang` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/24339

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: commands/expression/completion/TestExprCompletion.py (70 of 2704)
PASS: lldb-api :: commands/expression/dollar-in-variable/TestDollarInVariable.py (71 of 2704)
PASS: lldb-api :: commands/expression/dont_allow_jit/TestAllowJIT.py (72 of 2704)
PASS: lldb-api :: commands/expression/deleting-implicit-copy-constructor/TestDeletingImplicitCopyConstructor.py (73 of 2704)
PASS: lldb-api :: commands/expression/diagnostics/TestExprDiagnostics.py (74 of 2704)
PASS: lldb-api :: commands/expression/entry-bp/TestExprEntryBP.py (75 of 2704)
PASS: lldb-api :: commands/expression/error-limit/TestExprErrorLimit.py (76 of 2704)
PASS: lldb-api :: commands/expression/expr-with-fork/TestExprWithFork.py (77 of 2704)
PASS: lldb-api :: commands/expression/expr_inside_lambda/TestExprInsideLambdas.py (78 of 2704)
PASS: lldb-api :: commands/expression/fixits/TestFixIts.py (79 of 2704)
FAIL: lldb-api :: commands/expression/formatters/TestFormatters.py (80 of 2704)
******************** TEST 'lldb-api :: commands/expression/formatters/TestFormatters.py' FAILED ********************
Script:
--
C:/Users/tcwg/scoop/apps/python/current/python.exe C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/llvm-project/lldb\test\API\dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --env LLVM_INCLUDE_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/include --env LLVM_TOOLS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --triple aarch64-pc-windows-msvc --build-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build --lldb-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build/module-cache-lldb\lldb-api --clang-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build/module-cache-clang\lldb-api --executable C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/lldb.exe --lldb-python-dir C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lib\site-packages --compiler C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/clang.exe --dsymutil C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/dsymutil.exe --make C:/Users/tcwg/scoop/shims/make.exe --llvm-tools-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --lldb-obj-root C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb --lldb-libs-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --cmake-build-type Release --skip-category=watchpoint --env LLDB_LAUNCH_FLAG_USE_PIPES=1 C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\commands\expression\formatters -p TestFormatters.py --timeout 600
--
Exit Code: 1

Command Output (stdout):
--
Skipping the following test categories: watchpoint, libc++, libstdcxx, dwo, dsym, gmodules, debugserver, objc, fork, pexpect


--
Command Output (stderr):
--
UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_dsym (TestFormatters.ExprFormattersTestCase.test_dsym) (test case does not fall in any category of interest for this run) 

warning: failed to set breakpoint site at 0x8c597ff6b67141fc for breakpoint -6.1: Unable to read memory at breakpoint address.
PASS: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_dwarf (TestFormatters.ExprFormattersTestCase.test_dwarf)

UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_dwo (TestFormatters.ExprFormattersTestCase.test_dwo) (test case does not fall in any category of interest for this run) 

FAIL: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_pdb (TestFormatters.ExprFormattersTestCase.test_pdb)

Log Files:

 - C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\lldb-test-build\commands\expression\formatters\TestFormatters.pdb\Failure_test_pdb.log

======================================================================

FAIL: test_pdb (TestFormatters.ExprFormattersTestCase.test_pdb)

   Test expr + formatters for good interoperability.

----------------------------------------------------------------------

Traceback (most recent call last):


```

</details>

https://github.com/llvm/llvm-project/pull/232883