Rename "parallel recompilation" to "concurrent recompilation".

test/mjsunit/manual-parallel-recompile.js

Index: test/mjsunit/manual-parallel-recompile.js
diff --git a/test/mjsunit/manual-parallel-recompile.js b/test/mjsunit/manual-parallel-recompile.js
index 84bfff1a5735c7162b326a190227e24d8186ef06..0a0e61d5248c37ca35534f3f84cb1efd09c3e597 100644
--- a/test/mjsunit/manual-parallel-recompile.js
+++ b/test/mjsunit/manual-parallel-recompile.js
@@ -26,10 +26,10 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax --expose-gc
-// Flags: --parallel-recompilation --parallel-recompilation-delay=50
+// Flags: --concurrent-recompilation --concurrent-recompilation-delay=50
 
-if (!%IsParallelRecompilationSupported()) {
-  print("Parallel recompilation is disabled. Skipping this test.");
+if (!%IsConcurrentRecompilationSupported()) {
+  print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
@@ -53,12 +53,12 @@ f(g(1));
 assertUnoptimized(f);
 assertUnoptimized(g);
 
-%OptimizeFunctionOnNextCall(f, "parallel");
-%OptimizeFunctionOnNextCall(g, "parallel");
+%OptimizeFunctionOnNextCall(f, "concurrent");
+%OptimizeFunctionOnNextCall(g, "concurrent");
 f(g(2));  // Trigger optimization.
 
-assertUnoptimized(f, "no sync");  // Not yet optimized while parallel thread
+assertUnoptimized(f, "no sync");  // Not yet optimized while background thread
 assertUnoptimized(g, "no sync");  // is running.
 
-assertOptimized(f, "sync");  // Optimized once we sync with the parallel thread.
-assertOptimized(g, "sync");
+assertOptimized(f, "sync");  // Optimized once we sync with the
+assertOptimized(g, "sync");  // background thread.