[PATCH] [llgo] Roll gofrontend to 07baa07598ea; roll libffi to r219477.

[Peter Collingbourne]

Hi axw,

Incorporates https://codereview.appspot.com/198770044, which causes us to start
using the static chain register for closures instead of __go_{get,set}_closure.

http://reviews.llvm.org/D8829

Files:
  irgen/cabi.go
  irgen/call.go
  irgen/compiler.go
  irgen/runtime.go
  irgen/ssa.go
  libgo-noext.diff
  test/irgen/cabi.go
  test/irgen/imports.go
  test/irgen/mangling-synthetic.go
  update_third_party.sh

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