[clang] [ClangTool] Use CC1Option flag resource-dir in injectResourceDir (PR #140870)

[kadir çetinkaya via cfe-commits]

https://github.com/kadircet requested changes to this pull request.

do we know why https://github.com/llvm/llvm-project/blob/main/clang/include/clang/Driver/Options.td#L5894-L5901 doesn't declare _EQ version for cc1?

i think instead of working around this in various places, we should unify the two if possible. 

https://github.com/llvm/llvm-project/pull/140870