code review 148710043: runtime: fix memory profiler

runtime: fix memory profiler
There are 3 issues:
1. Skip argument of callers is off by 3,
so that all allocations are deep inside of memory profiler.
2. Memory profiling statistics are not updated after runtime.GC.
3. Testing package does not update memory profiling statistics
before capturing the profile.
Also add an end-to-end test.
Fixes issue 8867.

[dvyukov, 2014-10-08 11:54:16]

Hello golang-codereviews@googlegroups.com,

I'd like you to review this change to
https://dvyukov%40google.com@code.google.com/p/go/

[dvyukov, 2014-10-08 12:03:53]

Hello rsc@golang.org (cc: golang-codereviews@googlegroups.com),

Please take another look.

[rsc, 2014-10-16 13:51:39]

LGTM

[dvyukov, 2014-10-16 18:11:33]

*** Submitted as https://code.google.com/p/go/source/detail?r=3d61db5c1240 ***

runtime: fix memory profiler
There are 3 issues:
1. Skip argument of callers is off by 3,
so that all allocations are deep inside of memory profiler.
2. Memory profiling statistics are not updated after runtime.GC.
3. Testing package does not update memory profiling statistics
before capturing the profile.
Also add an end-to-end test.
Fixes issue 8867.

LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/148710043

[gobot, 2014-10-16 18:13:10]

This CL appears to have broken the plan9-amd64-aram builder.
See http://build.golang.org/log/ce74700a37dece64bd3746fd1d887a7adee3fdc4