[PATCH] Diagnose incompatible MMX asm constraints

[Tim Northover]

Hi Eli,

> Please use -verify instead of FileCheck to write tests for diagnostics.  Otherwise, looks fine.

Doesn’t -verify imply syntax-only? If so I don’t think it will spot the diagnostics I’ve added, which are unfortunately only easily producible once the target’s decided what it wants to map the type to in CodeGen.

A quick test seems to confirm that.

Cheers.

Tim