Change filecheck default to dump input on failure

Having the input dumped on failure seems like a better
default: I debugged FileCheck tests for a while without knowing
about this option, which really helps to understand failures.

Remove `-dump-input-on-failure` and the environment variable
FILECHECK_DUMP_INPUT_ON_FAILURE which are now obsolete.

Differential Revision: https://reviews.llvm.org/D81422

GitOrigin-RevId: d31c9e5a46ee692daf2430b52626afcea1db18ab
1 file changed