[dev.cc] code review 172960043: cmd/dist: adjust for build process without cmd/cc

cmd/dist: adjust for build process without cmd/cc

[This CL is part of the removal of C code from package runtime.
See golang.org/s/dev.cc for an overview.]

- Remove references to C compiler directories.
- Remove generation of special header files.
- Remove generation of Go source files from C declarations.

- Compile Go sources before rest of package (was after),
  so that Go compiler can write go_asm.h for use in assembly.

- Move TLS information from cmd/dist (was embedding in output)
  to src/runtime/go_tls.h, which it can be maintained directly.

[rsc, 2014-11-11 04:45:57]

Hello r (cc: austin, golang-codereviews@googlegroups.com, iant, khr),

I'd like you to review this change to the dev.cc branch of
https://code.google.com/p/go

[r, 2014-11-11 04:49:33]

LGTM

[dave_cheney.net, 2014-11-11 05:48:23]

On 2014/11/11 04:49:33, r wrote:
> LGTM

LGT. line 575 of build.c, the comment is no longer required

[rsc, 2014-11-11 06:29:10]

*** Submitted as https://code.google.com/p/go/source/detail?r=78d8a3352e27 ***

[dev.cc] cmd/dist: adjust for build process without cmd/cc

[This CL is part of the removal of C code from package runtime.
See golang.org/s/dev.cc for an overview.]

- Remove references to C compiler directories.
- Remove generation of special header files.
- Remove generation of Go source files from C declarations.

- Compile Go sources before rest of package (was after),
  so that Go compiler can write go_asm.h for use in assembly.

- Move TLS information from cmd/dist (was embedding in output)
  to src/runtime/go_tls.h, which it can be maintained directly.

LGTM=r
R=r, dave
CC=austin, golang-codereviews, iant, khr
https://codereview.appspot.com/172960043