Rename "parallel recompilation" to "concurrent recompilation".

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 9abca53821cf1f084d28d91e2add3f3f5377f15b..27a521cc687daefd81f96dd37a0a7d0bc5ea9ea8 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -9555,7 +9555,7 @@ void HTracer::TraceCompilation(CompilationInfo* info) {
 
 
 void HTracer::TraceLithium(const char* name, LChunk* chunk) {
-  ASSERT(!FLAG_parallel_recompilation);
+  ASSERT(!FLAG_concurrent_recompilation);
   AllowHandleDereference allow_deref;
   AllowDeferredHandleDereference allow_deferred_deref;
   Trace(name, chunk->graph(), chunk);
@@ -9563,7 +9563,7 @@ void HTracer::TraceLithium(const char* name, LChunk* chunk) {
 
 
 void HTracer::TraceHydrogen(const char* name, HGraph* graph) {
-  ASSERT(!FLAG_parallel_recompilation);
+  ASSERT(!FLAG_concurrent_recompilation);
   AllowHandleDereference allow_deref;
   AllowDeferredHandleDereference allow_deferred_deref;
   Trace(name, graph, NULL);