Rename "parallel recompilation" to "concurrent recompilation".

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 96b4011664bef5255601b653a0a664e1a7367551..b95862258e203cb40ef68dec60023f5d59b2600a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -6966,7 +6966,7 @@ class JSFunction: public JSObject {
   // Mark this function for lazy recompilation. The function will be
   // recompiled the next time it is executed.
   void MarkForLazyRecompilation();
-  void MarkForParallelRecompilation();
+  void MarkForConcurrentRecompilation();
   void MarkForInstallingRecompiledCode();
   void MarkInRecompileQueue();
 
@@ -6983,11 +6983,10 @@ class JSFunction: public JSObject {
   // Tells whether or not the function is already marked for lazy
   // recompilation.
   inline bool IsMarkedForLazyRecompilation();
-  inline bool IsMarkedForParallelRecompilation();
+  inline bool IsMarkedForConcurrentRecompilation();
   inline bool IsMarkedForInstallingRecompiledCode();
 
-  // Tells whether or not the function is on the parallel
-  // recompilation queue.
+  // Tells whether or not the function is on the concurrent recompilation queue.
   inline bool IsInRecompileQueue();
 
   // Check whether or not this function is inlineable.