- minor tweak to composite literal production: renamed PairExpr -> KeyValueExpr and PairExprList -> KeyValueList (to match corresponding nodes in AST per rsc' suggestion)
- minor tweak to composite literal production:
renamed PairExpr -> KeyValueExpr and PairExprList -> KeyValueList
(to match corresponding nodes in AST per rsc' suggestion)

- added a couple of TODOs

R=r,rsc
DELTA=10  (2 added, 0 deleted, 8 changed)
OCL=26837
CL=26840

tianon/debian-golang,gnanderson/go,tianon/debian-golang,tv42/old-go,bdwalton/debian-golang,nightlyone/golang,wesolows/golang,wesolows/golang-old,wesolows/golang,wesolows/golang-old,tianon/debian-golang,dsriram/golang,nightlyone/golang,firebitsbr/golang-old,apparentlymart/golang,apparentlymart/golang,bdwalton/debian-golang,tianon/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,tianon/debian-golang,wesolows/golang-old,ssrl/go,wesolows/golang-old,tianon/debian-golang,apparentlymart/golang,h8liu/golang,pombredanne/go-deleteme,ssrl/go,gnanderson/go,dsriram/golang,wesolows/golang,bdwalton/debian-golang,apparentlymart/golang,tv42/old-go,wesolows/golang,gnanderson/go,firebitsbr/golang-old,ssrl/go,nightlyone/golang,gnanderson/go,h8liu/golang,wesolows/golang,ssrl/go,ssrl/go,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,wesolows/golang,gnanderson/go,h8liu/golang,tv42/old-go,ssrl/go,tianon/debian-golang,firebitsbr/golang-old,firebitsbr/golang-old,h8liu/golang,dsriram/golang,nightlyone/golang,h8liu/golang,gnanderson/go,firebitsbr/golang-old,tv42/old-go,gnanderson/go,dsriram/golang,wesolows/golang,h8liu/golang,h8liu/golang,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,bdwalton/debian-golang,nightlyone/golang,wesolows/golang-old,ssrl/go,firebitsbr/golang-old,apparentlymart/golang,wesolows/golang-old,apparentlymart/golang,firebitsbr/golang-old,bdwalton/debian-golang,nightlyone/golang,wesolows/golang-old,dsriram/golang,nightlyone/golang,tianon/debian-golang,pombredanne/go-deleteme,pombredanne/go-deleteme,bdwalton/debian-golang,tv42/old-go,firebitsbr/golang-old,tv42/old-go,dsriram/golang