runtime: fix integer overflow in hashmap The test is problematic, because it requires 8GB+ of RAM. Fixes issue 5239.
runtime: fix integer overflow in hashmap
The test is problematic, because it requires 8GB+ of RAM.
Fixes issue 5239.

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/8550043

pombredanne/go-deleteme,tv42/old-go,dsriram/golang,dsriram/golang,apparentlymart/golang,gnanderson/go,gnanderson/go,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,gnanderson/go,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,dsriram/golang,apparentlymart/golang,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,gnanderson/go,gnanderson/go,gnanderson/go,apparentlymart/golang,dsriram/golang