When the CRETONNE_DBG environment variable is set, send debug messages to a file named cretonne.dbg.*. The trace facility is only enabled when debug assertions are on.
Lots of changes this time. Worked around what looks like a rustfmt bug in parse_inst_operands where a large match was nested inside Ok().
The 'src' and 'tests' top-level directories now contain tools sources and integration tests for any of the library crates.