[llvm] [ItaniumDemangle][NFC] Rename argument to not conflict with Android's NDK sysroot (PR #179079)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 179508 tests passed
* 3955 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### llvm-libc++abi-shared-cfg-in
<details>
<summary>llvm-libc++abi-shared-cfg-in.llvm-libc++abi-shared-cfg-in/itanium_demangle_matches_llvm.sh.test</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 4
tail -n +3 /home/gha/actions-runner/_work/llvm-project/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h > /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.libcxxabi_demangle
# executed command: tail -n +3 /home/gha/actions-runner/_work/llvm-project/llvm-project/libcxxabi/src/demangle/ItaniumDemangle.h
# note: command had no output on stdout or stderr
# RUN: at line 5
tail -n +3 /home/gha/actions-runner/_work/llvm-project/llvm-project/runtimes/../llvm/include/llvm/Demangle/ItaniumDemangle.h > /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.llvm_demangle
# executed command: tail -n +3 /home/gha/actions-runner/_work/llvm-project/llvm-project/runtimes/../llvm/include/llvm/Demangle/ItaniumDemangle.h
# note: command had no output on stdout or stderr
# RUN: at line 6
diff /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.libcxxabi_demangle /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.llvm_demangle
# executed command: diff /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.libcxxabi_demangle /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.llvm_demangle
# .---command stdout------------
# | *** /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.libcxxabi_demangle
# | --- /home/gha/actions-runner/_work/llvm-project/llvm-project/build/runtimes/runtimes-bins/libcxxabi/test/Output/itanium_demangle_matches_llvm.sh.test.dir/t.tmp.llvm_demangle
# | ***************
# | *** 1749,1756 ****
# |   };
# |   
# |   inline ExpandedSpecialSubstitution::ExpandedSpecialSubstitution(
# | !     SpecialSubstitution const *SS)
# | !     : ExpandedSpecialSubstitution(SS->SSK) {}
# |   
# |   class CtorDtorName final : public Node {
# |     const Node *Basename;
# | --- 1749,1756 ----
# |   };
# |   
# |   inline ExpandedSpecialSubstitution::ExpandedSpecialSubstitution(
# | !     SpecialSubstitution const *SSub)
# | !     : ExpandedSpecialSubstitution(SSub->SSK) {}
# |   
# |   class CtorDtorName final : public Node {
# |     const Node *Basename;
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/179079