[compiler-rt] [Profile] Disable continuous mode when reset to default.profraw due to malformed LLVM_PROFILE_FILE. (PR #74879)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

what about printing an error and immediately aborting when LLVM_PROFILE_FILE is invalid?

https://github.com/llvm/llvm-project/pull/74879