Fix assertions wrt concurrent OSR.

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

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 // Flags: --expose-debug-as debug --allow-natives-syntax
-// Flags: --block-concurrent-recompilation
+// Flags: --concurrent-recompilation --block-concurrent-recompilation
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 Debug = debug.Debug
 
 function foo() {
   var x = 1;
@@ skipping 18 matching lines @@
 Debug.clearAllBreakPoints();
 
 // At this point, concurrent recompilation is still blocked.
 assertUnoptimized(foo, "no sync");
 // Let concurrent recompilation proceed.
 %UnblockConcurrentRecompilation();
 
 // Install optimized code when concurrent optimization finishes.
 // This needs to be able to deal with shared code being a builtin.
 assertUnoptimized(foo, "sync");