[PATCH] [llgo] irgen: modify the ABI to use init guards instead of priority

[Peter Collingbourne]

Hi axw,

The new ABI is simpler for use cases such as dynamically loaded packages.

The calling convention for import functions is similar to what go/ssa would
produce if BareInits were cleared. However, simply clearing this flag causes
two additional issues:

 1) We would need to special case the 'init$guard' variable (see
    discussion in https://codereview.appspot.com/78780043/).

 2) The call to __go_register_gc_roots needs to appear in the right
    place, i.e. after the guard check. Making this check appear
    in the right place with non-bare inits seems unreliable at best.

So we keep BareInits set and generate the necessary code manually.

It is still possible to get the old ABI by specifying a path to a gccgo
installation.

http://reviews.llvm.org/D6804

Files:
  cmd/gllgo/gllgo.go
  irgen/compiler.go
  irgen/ssa.go
  test/irgen/imports.go

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