[debug] fix coverage for non-default test variants.

test/inspector/cpu-profiler/coverage.js

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --no-always-opt --crankshaft
 
 var source =
 `
 function fib(x) {
   if (x < 2) return 1;
   return fib(x-1) + fib(x-2);
 }
 function is_optimized(f) {
   return (%GetOptimizationStatus(f) & 16) ? "optimized" : "unoptimized";
 }
@@ skipping 242 matching lines @@
       .then(() => Protocol.Runtime.evaluate({ expression: "f()" }))
       .then(Protocol.Profiler.takePreciseCoverage)
       .then(LogSorted)
       .then(Protocol.Profiler.stopPreciseCoverage)
       .then(Protocol.Profiler.disable)
       .then(Protocol.Runtime.disable)
       .then(ClearAndGC)
       .then(next);
   },
 ]);