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Very basic REP+MOVS support #104

Draft

klauspost wants to merge 1 commit into mmcloughlin:master from klauspost:rep-movsb-simple-support

Commits on Dec 31, 2019

Very basic REP+MOVS support

Handcrafted support for REP+MOVS

I am not super into the generators, so some of the code is handcrafted to do a POC.

With this I am able to get correct registers and encoding:

```
	x := reg.RCX
	src, dst := reg.RSI, reg.RDI
	XORQ(x, x)
	LEAQ(a, src)
	LEAQ(b, dst)
	REP(x)
	MOVSB(src, dst)
```

klauspost committed Dec 31, 2019