Rename "parallel recompilation" to "concurrent recompilation".

test/mjsunit/regress/regress-opt-after-debug-deopt.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
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 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --expose-debug-as debug --allow-natives-syntax
-// Flags: --parallel-recompilation --parallel-recompilation-delay=100
+// Flags: --concurrent-recompilation --concurrent-recompilation-delay=100
 
-if (!%IsParallelRecompilationSupported()) {
-  print("Parallel recompilation is disabled. Skipping this test.");
+if (!%IsConcurrentRecompilationSupported()) {
+  print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 Debug = debug.Debug;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     assertEquals("foo", exec_state.frame(0).evaluate("a").value());
   } catch (e) {
     exception = e;
   };
   listened++;
 };
 
 var exception = null;
 var listened = 0;
 
 var f = function() {
   var a = "foo";
   var b = a.substring("1");
   [a, b].sort();
   return a;
 }
 
 f();
 f();
-%OptimizeFunctionOnNextCall(f, "parallel");  // Mark with builtin.
-f();                           // Kick off parallel recompilation.
+%OptimizeFunctionOnNextCall(f, "concurrent");  // Mark with builtin.
+f();                           // Kick off concurrent recompilation.
 
 Debug.setListener(listener);   // Activate debugger.
 Debug.setBreakPoint(f, 2, 0);  // Force deopt.
-// Sync with parallel optimization thread.  But no optimized code is installed.
+// Sync with optimization thread.  But no optimized code is installed.
 assertUnoptimized(f, "sync");
 
 f();                           // Trigger break point.
 assertEquals(1, listened);
 assertNull(exception);