code review 2335043: 6l: cleanup

5l, 6l, 8l: first pass cleanup

* Maintain Sym* list for text with individual
  prog lists instead of using one huge list and
  overloading p->pcond.
* Comment what each file is for.
* Move some output code from span.c to asm.c.
* Move profiling into prof.c, symbol table into symtab.c.
* Move mkfwd to ld/lib.c.
* Throw away dhog dynamic loading code.
* Throw away Alef become.
* Fix printing of WORD instructions in 5l -a.

Goal here is to be able to handle each piece of text or data
as a separate piece, both to make it easier to load the
occasional .o file and also to make it possible to split the
work across multiple threads.

[rsc, 2010-10-07 15:17:00]

Hello ken2, r (cc: golang-dev@googlegroups.com),

I'd like you to review this change.

[rsc, 2010-10-07 15:20:29]

... http://codereview.appspot.com/2335043/

Looking for comments before applying same
changes to 5l, 8l.  All tests pass in the amd64
build with these changes.  Become and the dlm
stuff both have a small amount of utility but it was
outweighed by getting in the way.  We can always
bring it back later in the off chance that we need it.

Russ

[ken3, 2010-10-08 20:20:43]

lgtm

[rsc, 2010-10-13 19:47:48]

Added 5l, 8l to this CL (have to keep in sync with ld directory).

[rsc, 2010-10-13 19:51:25]

*** Submitted as 6320f16de5c9 ***

5l, 6l, 8l: first pass cleanup

* Maintain Sym* list for text with individual
  prog lists instead of using one huge list and
  overloading p->pcond.
* Comment what each file is for.
* Move some output code from span.c to asm.c.
* Move profiling into prof.c, symbol table into symtab.c.
* Move mkfwd to ld/lib.c.
* Throw away dhog dynamic loading code.
* Throw away Alef become.
* Fix printing of WORD instructions in 5l -a.

Goal here is to be able to handle each piece of text or data
as a separate piece, both to make it easier to load the
occasional .o file and also to make it possible to split the
work across multiple threads.

R=ken2, r, ken3
CC=golang-dev
http://codereview.appspot.com/2335043