Rename "parallel recompilation" to "concurrent recompilation".

test/mjsunit/parallel-initial-prototype-change.js

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 // Flags: --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 f1(a, i) {
   return a[i] + 0.5;
 }
 
 var arr = [0.0,,2.5];
 assertEquals(0.5, f1(arr, 0));
 assertEquals(0.5, f1(arr, 0));
 
 // Optimized code of f1 depends on initial object and array maps.
-%OptimizeFunctionOnNextCall(f1, "parallel");
+%OptimizeFunctionOnNextCall(f1, "concurrent");
 // Trigger optimization in the background thread
 assertEquals(0.5, f1(arr, 0));
 Object.prototype[1] = 1.5;  // Invalidate current initial object map.
 assertEquals(2, f1(arr, 1));
 // Not yet optimized while background thread is running.
 assertUnoptimized(f1, "no sync");
 // Sync with background thread to conclude optimization, which bails out
 // due to map dependency.
 assertUnoptimized(f1, "sync");