Comment 16 for bug 1953128

OK, so the real problem in the test case is the constraint ("nor") is meaningless on Arm (because there is no instruction in the architecture that can accept both a constant and a memref) and this confuses the minipool code because it exploits this restriction to detect insns that need to be reworked by the md_reorg pass.

When processing an ASM we allow only a forward literal pool reference and it must be less than 250 bytes beyond the /start/ of the pattern (because we don't know where in the asm it gets used). So we have to deduct from that range 4 bytes for every asm statement: add too many lines to the asm and we reach the point where it is impossible to place the literal pool even directly after the asm.

So I think really this is an ICE on invalid, because the constraint is not meaningful on Arm.