tree 44a8919375cc1c65a1ce94996dbba473a9904366
parent aa8cc983fb1ddbc6eb388cfcb60ec7b48f603aee
author Michel Lespinasse <walken@google.com> 1480729757 -0800
committer Michel Lespinasse <walken@google.com> 1480989692 -0800

Replace go 1.7.3 compiler with go 1.7.4 compiler

Also remove old 1.4.2 and 1.5.1 compilers which aren't used anymore.
(We still keep the bootstrap 1.4.2 compiler of course).

Change-Id: I7f8ea2a435466d903637e1fc29d64511145a5232