runtime: refactor helpgc functionality in preparation for parallel GC
Parallel GC needs to know in advance how many helper threads will be there.
Hopefully it's the last patch before I can tackle parallel sweep phase.
The benchmarks are unaffected.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6200064
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 15f5fa3..1f78191 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -636,7 +636,7 @@
#pragma varargck type "S" String
void runtime·stoptheworld(void);
-void runtime·starttheworld(bool);
+void runtime·starttheworld(void);
extern uint32 runtime·worldsema;
/*
