[Chapel Merge] Adjust llvmDebug_test.py to handle system llvm

Branch: refs/heads/master
Revision: 34f08bf
Author: mppf
Log Message:

Merge pull request #16672 from mppf/fix-llvm-debug-test-system

Adjust llvmDebug_test.py to handle system llvm

Follow up to PR #16613 and PR #16560

System LLVM installations use versioned commands
like instead of llvm-dwarfdump we have llvm-dwarfdump-10.

This commit adjusts the test to handle that.

Test change only - not reviewed.

Modified Files:
M test/llvm/llvmDebug/llvmDebug_test.py

Compare: https://github.com/chapel-lang/chapel/compare/13c9a7e9810e...34f08bfe1e88