Rename "parallel recompilation" to "concurrent recompilation".

test/mjsunit/regress/regress-debug-deopt-while-recompile.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 43 matching lines @@
   return bar;
 }
 
 f();
 f();
 g();
 g();
 
 // Mark with builtin.
 %OptimizeFunctionOnNextCall(f);
-if (%IsParallelRecompilationSupported()) {
-  %OptimizeFunctionOnNextCall(g, "parallel");
+if (%IsConcurrentRecompilationSupported()) {
+  %OptimizeFunctionOnNextCall(g, "concurrent");
 }
 
 // Activate debugger.
 Debug.setListener(listener);
 
  // Set break point.
 Debug.setBreakPoint(f, 2, 0);
 Debug.setBreakPoint(g, 2, 0);
 
 // Trigger break point.
 f();
 g();
 
 // Assert that break point is set at expected location.
 assertTrue(Debug.showBreakPoints(f).indexOf("[B0]var baz = bar;") > 0);
 assertTrue(Debug.showBreakPoints(g).indexOf("[B0]var baz = bar;") > 0);
 
 assertEquals(2, listened);
 assertNull(exception);