R=iant, ken2, r, r2, ken3
CC=golang-dev
https://golang.org/cl/1686044

R=rsc, iant
CC=golang-dev
https://golang.org/cl/1718042

R=rsc, iant
CC=golang-dev
https://golang.org/cl/1694044

This CL replaces my earlier https://golang.org/cl/1640044/show
in which Continue handling was explicit.  Instead, this CL makes
it automatic.  Reading from Body() is an implicit acknowledgement
that the request headers were fine and the body is wanted.  In that
case, the 100 Continue response is written automatically when the
request continues the "Expect: 100-continue" header.

R=rsc, adg
CC=golang-dev
https://golang.org/cl/1610042

R=rsc
TBR=rsc
CC=golang-dev
https://golang.org/cl/1675047

R=rsc
CC=golang-dev, rog
https://golang.org/cl/1707042

While we're at it, clean up and test the code to guarantee we see every byte when
the text is erroneous UTF-8.

Fixes #866.

R=rsc
CC=golang-dev
https://golang.org/cl/1712042

Fixes #852.

R=rsc
CC=golang-dev
https://golang.org/cl/1680042

R=rsc
CC=golang-dev
https://golang.org/cl/1698041

R=r
CC=golang-dev
https://golang.org/cl/1703041

Fix a bug that caused it to ignore field widths.

R=rsc
CC=golang-dev
https://golang.org/cl/1704041

This shortens, simplifies and regularizes the code significantly.
(Improvements to reflect could make another step.)
Passes all.bash.

One semantic change occurs: The String() method changes
behavior. It used to run only for string formats such as %s and %q.
Instead, it now runs whenever the item has the method and the
result is then processed by the format as a string. Besides the
regularization, this has three effects:

	1) width is honored for String() items
	2) %x works for String() items
	3) implementations of String that merely recur will recur forever

Regarding point 3, example from the updated documentation:
	type X int
	func (x X) String() string { return Sprintf("%d", x) }
should cast the value before recurring:
	func (x X) String() string { return Sprintf("%d", int(x)) }

R=rsc
CC=golang-dev
https://golang.org/cl/1613045

R=rsc
CC=golang-dev
https://golang.org/cl/1701041

It fails with 6g. Once 6g is fixed up I will extend the value tests.

R=rsc, iant
CC=golang-dev
https://golang.org/cl/1677043

Change TrimRight and TrimLeft to use these functions.
Incidentally fix minor bug in TrimRight.
Add some test cases for this.
YMMV whether it's worth saving the closure allocation.

R=r, r2
CC=golang-dev, hoisie, rsc
https://golang.org/cl/1198044

R=rsc
CC=golang-dev
https://golang.org/cl/1677042

various cleanup, deleting unused code

R=ken2
CC=golang-dev
https://golang.org/cl/1663041

R=r
CC=golang-dev
https://golang.org/cl/1662041

Make dpix variable names consistent.

R=rsc
CC=golang-dev
https://golang.org/cl/1563041

R=gri, iant, ken2, r, r2
CC=golang-dev
https://golang.org/cl/1632041

Cleans up a few other corner cases too.

R=ken2
CC=golang-dev
https://golang.org/cl/1592045

Cannot assume that g == m->curg at time of signal.
Must save actual g and restore.

Fixes flaky crashes with messages like

throw: malloc mlookup
throw: malloc/free - deadlock
throw: unwindstack on self
throw: free mlookup

(and probably others) when running cgo.

R=iant
CC=golang-dev
https://golang.org/cl/1648043

R=r
CC=golang-dev
https://golang.org/cl/1597044

R=golang-dev
CC=golang-dev
https://golang.org/cl/1641043

R=ken2
CC=golang-dev
https://golang.org/cl/1627042

There's only one Go object file per package now,
so there's no need to parse the metadata and merge
metadata from multiple files.  Just save the original
and use it as __.PKGDEF verbatim.

R=r
CC=golang-dev
https://golang.org/cl/1647042

R=ken2
CC=golang-dev
https://golang.org/cl/1597043

This avoids a crash when using cgo where glibc's malloc thinks
that it can use some of the memory following the symbol table.
This fails because the symbol table is mapped read-only, which
affects the whole page.

R=rsc
CC=golang-dev
https://golang.org/cl/1616042

R=rsc
CC=golang-dev
https://golang.org/cl/1381041

R=rsc
CC=golang-dev
https://golang.org/cl/1652041

R=r
CC=golang-dev
https://golang.org/cl/1615042

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/1555042

R=rsc
CC=golang-dev
https://golang.org/cl/1585041

R=r
CC=golang-dev
https://golang.org/cl/1649041

R=rsc
CC=golang-dev
https://golang.org/cl/1633042

Although technically incorrect, we want this in order to parse X.509
certificates where a wildcard hostname ("*.example.com") has been put
into a PrintableString.

Fixes #850.

R=rsc
CC=golang-dev
https://golang.org/cl/1615043

R=r
CC=golang-dev
https://golang.org/cl/1644042

R=r
CC=golang-dev
https://golang.org/cl/1599043

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/1636043

R=rsc
CC=golang-dev
https://golang.org/cl/1626043