cmd/7g: generate HINT $con rather than HINT R, R
cmd/7g: generate HINT $con rather than HINT R, R

Fixes:

00400 (/Users/aram/go/src/runtime/cgocall.go:117)	HINT	R0,R0
00492 (/Users/aram/go/src/runtime/cgocall.go:134)	HINT	R0,R0
00400 (/Users/aram/go/src/runtime/cgocall.go:117)	HINT	R0,R0
00492 (/Users/aram/go/src/runtime/cgocall.go:134)	HINT	R0,R0
00140 (/Users/aram/go/src/runtime/cgocall.go:203)	HINT	R0,R0
00456 (/Users/aram/go/src/runtime/cgocall.go:244)	HINT	R0,R0
00140 (/Users/aram/go/src/runtime/cgocall.go:203)	HINT	R0,R0
00456 (/Users/aram/go/src/runtime/cgocall.go:244)	HINT	R0,R0
00492 (/Users/aram/go/src/runtime/cpuprof.go:154)	NEG	,R11
../runtime/alg.go:1: illegal combination 00400 (/Users/aram/go/src/runtime/cgocall.go:117)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00492 (/Users/aram/go/src/runtime/cgocall.go:134)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00400 (/Users/aram/go/src/runtime/cgocall.go:117)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00492 (/Users/aram/go/src/runtime/cgocall.go:134)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00140 (/Users/aram/go/src/runtime/cgocall.go:203)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00456 (/Users/aram/go/src/runtime/cgocall.go:244)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00140 (/Users/aram/go/src/runtime/cgocall.go:203)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00456 (/Users/aram/go/src/runtime/cgocall.go:244)	HINT	R0,R0 REG NONE		= 0 REG, 14 14
../runtime/alg.go:1: illegal combination 00492 (/Users/aram/go/src/runtime/cpuprof.go:154)	NEG	,R11 NONE		= 0 NONE		= 0 REG, 1 14
../runtime/alg.go:1: illegal combination 00616 (/Users/aram/go/src/runtime/cpuprof.go:158)	MOVBU	R10,3211324(R9) REG NONE		= 0 LOREG, 14 7
../runtime/alg.go:1: too many errors

Change-Id: If9c1798af238d380ab3e25ecce9073ead62fece6

frobware/go,frobware/go,frobware/go,frobware/go,frobware/go,frobware/go,frobware/go