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

[Peter Collingbourne]

================
Comment at: irgen/ssa.go:429
@@ +428,3 @@
+		if !fr.GccgoABI {
+			initGuard := llvm.AddGlobal(fr.module.Module, llvm.Int1Type(), "init$guard")
+			initGuard.SetLinkage(llvm.InternalLinkage)
----------------
axw wrote:
> Would you mind moving this code to a separate function? defineFunction is getting a bit long.
Done.

http://reviews.llvm.org/D6804

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