[llvm] r183238 - ARM: Fix crash in ARM backend inside of ARMConstantIslandPass

[Tim Northover]

> The architecture in the test case provided was armv4t, which does not have
> MOVW/MOVT.

It should have the older "MOV (imm)" instructions though, shouldn't
it? They seem to support 8-bits in both ARM and Thumb.

I'm not even that sure 8-bit loads *should* be supported. We're
unlikely to allocate entries on an 8-bit granularity which means we
can set the rest of the pool entry so that "ldr r0,[wherever]" would
be just as effective and probably no more expensive than the ldrb.

Not that I think it would be a bad thing necessarily, just probably pointless.

Cheers.

Tim