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b7e2235973
* fix handling of `ah`, `bh`, `ch`, and `dh` registers (which are actually used as aliases to `dil`, etc. registers). Currenly, we treat them as aliases only meaning when we encounter `ah` we make sure to set the REX.W to promote the instruction to 64bits and use `dil` register instead - otherwise we might have mismatch between registers used in different parts of the codegen. In the future, we can and should use `ah`, etc. as upper 8bit halves of 16bit registers `ax`, etc. * fix bug in `airCmp` where `.cmp` MIR instruction shouldn't force type `Bool` but let the type of the original type propagate downwards - we need this to make an informed choice of the target register size and hence choose the right encoding down the line. * implement lowering of 1-byte and 2-byte values to stack and add matching stage2 tests for x86_64 codegen