On Linux, overwriting an mmap'ed file causes
all the MAP_PRIVATE pages to get refreshed
with the new content, even ones that have been
modified by the process that did the mmap.

One specific instance of this is that after the
dynamic linker has relocated a page from a .so,
overwriting the .so will un-relocate it, making
the next use of one of the no-longer-relocated
addresses incorrect and probably crash the
program.

Linux must go out of its way to break programs
in this way: the pages have already been copied
on write, so they're not shared with the file system
cache, and it trashes them anyway.  The manual
says the behavior when the file gets overwritten
is "undefined".  Removing before copy avoids the
undefined behavior.

R=iant
CC=golang-dev, msolo
https://golang.org/cl/2333045

R=ken2
CC=golang-dev
https://golang.org/cl/2345041

R=r, r2
CC=golang-dev
https://golang.org/cl/2308043

This crops up in a lot of places.
It's just a one-liner, but doesn't add any dependancies.
Seems worth it.

R=r, r2
CC=golang-dev
https://golang.org/cl/2344041

	lv += f()
fixes asn1 and maybe more

R=rsc
CC=golang-dev
https://golang.org/cl/2341042

confused by using isddd for both ONAME and OCALL

Fixes #1136.

R=ken2
CC=golang-dev
https://golang.org/cl/2314043

R=ken2
CC=golang-dev
https://golang.org/cl/2338041

Implies no embedding of pointer to interface value either.

R=gri, iant, ken2, r, r2
CC=golang-dev
https://golang.org/cl/2289041

R=r, r2
CC=golang-dev
https://golang.org/cl/2329042

TBR=r
CC=golang-dev
https://golang.org/cl/2333043

Fixes racy regex-dna-parallel crashes.

R=r, r2
CC=golang-dev
https://golang.org/cl/2308042

R=nigeltao, nigeltao_gnome
CC=golang-dev
https://golang.org/cl/2330041

R=golang-dev, nigeltao_gnome
CC=golang-dev
https://golang.org/cl/2329041

R=r, r2
CC=golang-dev
https://golang.org/cl/2315042

R=adg, rsc
CC=golang-dev
https://golang.org/cl/2303041

R=adg, r2
CC=golang-dev
https://golang.org/cl/2302041

R=r, r2
CC=golang-dev
https://golang.org/cl/2323042

R=adg
TBR=adg
CC=golang-dev
https://golang.org/cl/2326041

R=rsc
CC=golang-dev
https://golang.org/cl/2125042

R=r
CC=golang-dev
https://golang.org/cl/2270041

R=r, r2
CC=golang-dev
https://golang.org/cl/2301041

R=r, r2
CC=golang-dev
https://golang.org/cl/2312041

R=ken2
CC=golang-dev
https://golang.org/cl/2313041

R=rsc, stephenm
CC=golang-dev
https://golang.org/cl/2310041

An entirely mechanical change, with these exceptions:
- removed 'stub questions' that reference the other FAQs
- removed "Why doesn't Go run on Windows yet?" - out of date

I will follow this CL with another that updates many of the
answers to make them more current.

R=r
CC=golang-dev
https://golang.org/cl/2300041

R=rsc
CC=golang-dev
https://golang.org/cl/1993043

Fixes #946.

R=r, r2
CC=golang-dev
https://golang.org/cl/2137048

R=ken2
CC=golang-dev
https://golang.org/cl/2298041

R=r, brainman
CC=golang-dev
https://golang.org/cl/2297041

R=nigeltao
CC=golang-dev
https://golang.org/cl/2290041

TBR=r
CC=golang-dev
https://golang.org/cl/2296041

R=rsc
CC=golang-dev
https://golang.org/cl/2295041

On systems where the mmap succeeds
(e.g., sysctl -w vm.mmap_min_addr=0)
it changes the signal code delivered for a
nil fault from ``page not mapped'' to
``invalid permissions for page.''

TBR=r
CC=golang-dev
https://golang.org/cl/2294041

R=r, iant, robert.swiecki, rsc1
CC=golang-dev
https://golang.org/cl/1904044

Fixes #1134.

R=r, r2
CC=golang-dev
https://golang.org/cl/2264043

R=iant, r, rsc, rog
CC=golang-dev
https://golang.org/cl/2226047

Was also recording for .dynstrtab which made the
table run out of space and would have caused confusion
if the ELF code tried to refer to any of the strings.

R=r
CC=golang-dev
https://golang.org/cl/2288041

Fixes #977.
Fixes #451.

R=r, r2
CC=golang-dev
https://golang.org/cl/2246049

Fixes #451.
Fixes #770.

R=ken2
CC=golang-dev
https://golang.org/cl/2207045

Silence warnings about not checking
return values from read and write system calls.

R=r, r2
CC=golang-dev
https://golang.org/cl/2258045