[clang] [analyzer] Emit IssueHash in SARIF (PR #159445)

[Mark Danial via cfe-commits]

madanial0 wrote:

The `sed -r` change causes failures on the clang-aix bot https://lab.llvm.org/buildbot/#/builders/64/builds/5911:
```
  Clang :: Analysis/diagnostics/sarif-diagnostics-taint-test.c
  Clang :: Analysis/diagnostics/sarif-multi-diagnostic-test.c
  Clang :: Analysis/diagnostics/sarif-multi-file-diagnostics.c
``` 
as  `sed -r` is not supported on AIX. Is there a way to modify these test cases to avoid using `sed -r`?

https://github.com/llvm/llvm-project/pull/159445