parser: reduce some automatic inlining

parser: reduce some automatic inlining

* readable and writable with automatic opt
* stmtsn = stmts + n
* noend -> nolabel
* remove methid~noassign variant
* remove propdefs_tail

Currently, the only automatic inlining that remains are:

* PRedef
* PRecv
* PImplicitTopClass
* PRecvNopar
* PRecvNobra

Before:
* maketime=1m35s
* parser_tables.nit=492KB
* parser.nit=1.3MB
* nb reduceactions=1199
After:
* maketime=28s
* parser_tables=251KN
* parser.nit=501KB
* nb reduceactions=664

Signed-off-by: Jean Privat <jean@pryen.org>