[llvm] [GlobalISel] Bail out early for big-endian (PR #103310)

[David Green via llvm-commits]

davemgreen wrote:

It looks like this is failing on a couple of Arm tests because it is expecting the ir-translator to produce testable results even under BE.

> Silly question: why was "unable to translate in big endian mode" not visible in the error report?

By "error report", do you mean the fall-back remarks? -O0 will use -global-isel-abort=0 (I think), so not report the remarks or error out, it just prints a dbgs() message and otherwise silently falls back to SDAG.

https://github.com/llvm/llvm-project/pull/103310