ZJIT: Fix side-exit panicking when there's too many locals

Previously, ARM64 panicked due to compiled_side_exits() when the memory
displacement got large enough to exceed the 9 bits limit. Usually, we split
these kind of memory operands, but compiled_side_exits() runs after
split.

Using scratch registers, implement `Insn::Store` on ARM such that it can
handle large displacements without split(). Do this for x86 as well, and
remove arch specific code from compiled_side_exits(). We can now run
`TestKeywordArguments`.

Since `Insn::Store` doesn't need splitting now, users enjoy lower
register pressure.

Downside is, using `Assembler::SCRATCH_REG` as a base register is now
sometimes an error, depending on whether `Insn::Store` also needs to
use the register. It seems a fair trade off since `SCRATCH_REG` is
not often used, and we don't put it as a base register anywhere at the
moment.

0 files changed, 0 insertions, 0 deletions