cmd/compile: delete the legacy compiler back end

[randall77]

When all the SSA backends are done, delete the legacy compiler.

This is basically a tracking bug for the work on all the SSA backends.

amd64 - done
arm - #15365
arm64 - #16009
ppc64 - #16010 #16175

[randall77]

386 - #16358

[bradfitz]

mips64, @cherrymui ?

[cherrymui]

MIPS64- #16359

[randall77]

amd64p32 is now using the SSA backend.

https://go-review.googlesource.com/c/25586/

[randall77]

386 (including GO386=387) is now using the SSA backend.

[randall77]

ARM is done.

[randall77]

MIPS64 is done.

All that is left is s390x and ppc64(be).

[dr2chase]

ppc64be lacks only a test machine.
Last time it was tested, it worked, or so I hear.

On Fri, Aug 26, 2016 at 4:51 PM, Keith Randall notifications@github.com
wrote:

MIPS64 is done.

All that is left is s390x and ppc64(be).

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[billotosyr]

working on s390x

[randall77]

arm64 is done.

[randall77]

s390x is done #16677
We now have the greenlight to start deleting the legacy compiler.
Any suggestions on how to do the equivalent of GOSSAHASH when there is no longer a legacy compiler are welcome.

[bradfitz]

@randall77, could GOSSAHASH remain but instead of using the old backend, mean to disable optimizations (like -N)?