Rename "parallel recompilation" to "concurrent recompilation".

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index 649e0f69a27b3adabb8e250ed5963b299fb429b8..83b45ab28a3eb0395e439a8a866ac84f80c48328 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -2826,7 +2826,7 @@ void ReleaseStackTraceDataTest(const char* source, const char* accessor) {
   // to check whether the data is being released since the external string
   // resource's callback is fired when the external string is GC'ed.
   FLAG_use_ic = false;  // ICs retain objects.
-  FLAG_parallel_recompilation = false;
+  FLAG_concurrent_recompilation = false;
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
   SourceResource* resource = new SourceResource(i::StrDup(source));