Build the pinned termtris branch (be5b323) with this compiler, assemble
and link it with the TI 1987 GSPA/GSPLNK and RTS.LIB, and run the proven
play_keys board/move/panels/quit paths in MAME with the M4 loader. Add
the contiguous-stack varargs MAME probe and the switch-to-lookup driver
regression check. The termtris build found the i8/i16 argument, i1/
anyext load, nested-data, MULHS and late-GEP gaps fixed in the compiler.
Scripts/tms-clang runs the generic opt pipeline without a target machine, so
the target cannot veto IndVarSimplify's exit-value replacement through TTI.
That rewrite turns sumto's closed form into an i33 multiply, which llc cannot
select. Disable only that rewrite with -replexitval=never and document why.
Preserve the dis34 output on a failed round-trip instead of claiming a
deleted temp file is kept, require GSPA "No Warnings" in addition to
"No Errors", and correct the six-function and M1 pipeline comments.
arti