Introduce helper functions to test parallel recompilation.

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index caed34bab5ce57427cfcc0cbcc83b61d828eabfd..146b8dc48fafa4d885c37c975da1660a20379a81 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -85,7 +85,9 @@ namespace internal {
   F(NewStrictArgumentsFast, 3, 1) \
   F(LazyCompile, 1, 1) \
   F(LazyRecompile, 1, 1) \
-  F(ParallelRecompile, 1, 1)     \
+  F(ParallelRecompile, 1, 1) \
+  F(ForceParallelRecompile, 1, 1) \
+  F(InstallRecompiledCode, 1, 1) \
   F(NotifyDeoptimized, 1, 1) \
   F(NotifyOSR, 0, 1) \
   F(DeoptimizeFunction, 1, 1) \