[tests] Cleanup tests that use assertOptimized()/assertUnoptimized().

test/mjsunit/compiler/manual-concurrent-recompile.js

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 // Flags: --allow-natives-syntax --expose-gc
 // Flags: --concurrent-recompilation --block-concurrent-recompilation
+// Flags: --crankshaft --no-always-opt
 
 if (!%IsConcurrentRecompilationSupported()) {
   print("Concurrent recompilation is disabled. Skipping this test.");
   quit();
 }
 
 function f(x) {
   var xx = x * x;
   var xxstr = xx.toString();
   return xxstr.length;
@@ skipping 24 matching lines @@
 f(g(3));  // Kick off recompilation.
 
 assertUnoptimized(f, "no sync");  // Not yet optimized since recompilation
 assertUnoptimized(g, "no sync");  // is still blocked.
 
 // Let concurrent recompilation proceed.
 %UnblockConcurrentRecompilation();
 
 assertOptimized(f, "sync");  // Optimized once we sync with the
 assertOptimized(g, "sync");  // background thread.