[llvm] [Support] report_fatal_error: Do not generate crash backtrace by default (PR #128495)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Solved by #138251

Not really, we still need all of these test diffs. There ideally would be 0 instances of not --crash in the test suite 

https://github.com/llvm/llvm-project/pull/128495