Rename "parallel recompilation" to "concurrent recompilation".

test/mjsunit/parallel-invalidate-transition-map.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --track-fields --track-double-fields --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();
 }
 
 function new_object() {
   var o = {};
   o.a = 1;
   o.b = 2;
   return o;
 }
 
 function add_field(obj) {
   obj.c = 3;
 }
 
 add_field(new_object());
 add_field(new_object());
-%OptimizeFunctionOnNextCall(add_field, "parallel");
+%OptimizeFunctionOnNextCall(add_field, "concurrent");
 
 var o = new_object();
 // Trigger optimization in the background thread.
 add_field(o);
 // Invalidate transition map while optimization is underway.
 o.c = 2.2;
 // Sync with background thread to conclude optimization that bailed out.
 assertUnoptimized(add_field, "sync");