runtime,sync/atomic: replace asm BYTEs with insts for x86

runtime,sync/atomic: replace asm BYTEs with insts for x86

For each replacement, test case is added to new 386enc.s file
with exception of EMMS, SYSENTER, MFENCE and LFENCE as they
are already covered in amd64enc.s (same on amd64 and 386).

The replacement became less obvious after go vet suggested changes
Before:
	BYTE $0x0f; BYTE $0x7f; BYTE $0x44; BYTE $0x24; BYTE $0x08
Changed to MOVQ (this form is being tested):
	MOVQ M0, 8(SP)
Refactored to FP-relative access (go vet advice):
	MOVQ M0, val+4(FP)

Change-Id: I56b87cf3371b6ad81ad0cd9db2033aee407b5818
Reviewed-on: https://go-review.googlesource.com/101475
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ilya Tocar <ilya.tocar@intel.com>