likely to go back to registers for most temporaries.
most tests in lib pass. these fail:
datafmt
fmt
go/scanner
log
reflect
strconv
template
R=ken
OCL=29896
CL=29898
* string format changed
* files got renamed
* new files that i forgot to check in last time
updates are all copy and paste from 6g
R=ken
OCL=29385
CL=29400