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

[Aaron Ballman via llvm-commits]

AaronBallman wrote:

I think this change should go through the RFC process. `report_fatal_error` is exposed in LLVM but is used by other projects in the community and different parts of the community may have different needs or input on defaults.

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