code review 5598049: go: move compilers into the go-tool directory

go: move compilers into the go-tool directory
Also delete gotest, since it's messy to fix and slated for deletion anyway.
A couple of things outside src can't be tested any more. "go test" will be
fixed and these tests will be re-enabled. They're noisy for now.

Fixes issue 284.

[r, 2012-01-30 22:39:29]

Hello golang-dev@googlegroups.com,

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

[rsc1, 2012-01-30 22:45:15]

LGTM

[r, 2012-01-30 22:46:34]

*** Submitted as dcbd5d0762b2 ***

go: move compilers into the go-tool directory
Also delete gotest, since it's messy to fix and slated for deletion anyway.
A couple of things outside src can't be tested any more. "go test" will be
fixed and these tests will be re-enabled. They're noisy for now.

Fixes issue 284.

R=rsc
CC=golang-dev
http://codereview.appspot.com/5598049