[AArch64] Don't try to compress jump tables if there are any inline asm instructions.

Inline asm can contain constructs like .bytes which may have arbitrary size.
In some cases, this causes us to miscalculate the size of blocks and therefore
offsets, causing us to incorrectly compress a JT.

To be safe, just bail out of the whole thing if we find any inline asm.

Fixes PR48255

Differential Revision: https://reviews.llvm.org/D92865