[pull] master from ruby:master #144
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Previously we were issuing writebarriers for each cc, but were missing the cme. We also need to avoid it being possible to run GC after we've copied the values into the allocated array, but before they're visible in the object.
Save a couple instructions to load a small negative constant into a register. In fact MOVN is speced to alias as `mov` in the official disassembly.
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.
Co-authored-by: Takashi Kokubun <takashi.kokubun@shopify.com>
This allows us to annotate builtin functions with their return type.
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