`-gen-reproducer` causes crash reproduction to be emitted
even when clang didn't crash, and now can optionally take an
argument of never, on-crash (default), on-error and always.
Differential revision: https://reviews.llvm.org/D120201
-gen-reproducer causes crash reproduction to be emitted even
when clang didn't crash, and now can optionally take an argument
of never, on-crash (default), on-error and always.
Differential revision: https://reviews.llvm.org/D120201