Rename "parallel recompilation" to "concurrent recompilation".

test/mjsunit/regress/regress-prepare-break-while-recompile.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // met:
 //
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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-delay=300
+// Flags: --concurrent-recompilation-delay=300
 
-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 foo() {
   var x = 1;
   return x;
 }
 
 function bar() {
   var x = 2;
   return x;
 }
 
 foo();
-// Mark and trigger parallel optimization.
-%OptimizeFunctionOnNextCall(foo, "parallel");
+// Mark and trigger concurrent optimization.
+%OptimizeFunctionOnNextCall(foo, "concurrent");
 foo();
 
 // Set break points on an unrelated function. This clears both optimized
 // and (shared) unoptimized code on foo, and sets both to lazy-compile builtin.
 // Clear the break point immediately after to deactivate the debugger.
 Debug.setBreakPoint(bar, 0, 0);
 Debug.clearAllBreakPoints();
 
-// Install optimized code when parallel optimization finishes.
+// Install optimized code when concurrent optimization finishes.
 // This needs to be able to deal with shared code being a builtin.
 assertUnoptimized(foo, "sync");