compiler: turn on escape analysis by default
The escape analysis now runs by default. It can be disabled with
the negative flag, -fno-go-optimize-allocs.
Reviewed-on: https://go-review.googlesource.com/86247
* lang.opt (fgo-optimize): Remove RejectNegative.
* go-c.h (go_enable_optimize): Update declaration to take value
argument.
* go-lang.c (go_langhook_handle_option): Pass value to
go_enable_optimize.
* gccgo.texi (Invoking gccgo): Update -fgo-optimize-allocs doc.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@257319 138bc75d-0d04-0410-961f-82ee72b054a4