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

test/mjsunit/unary-minus-deopt.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft --no-always-opt
 
 // This is a boiled-down example happening in the Epic Citadel demo:
 // After deopting, the multiplication for unary minus stayed in Smi
 // mode instead of going to double mode, leading to deopt loops.
 
 function unaryMinusTest(x) {
   var g = (1 << x) | 0;
   // Optimized code will contain a LMulI with -1 as right operand.
   return (g & -g) - 1 | 0;
 }
 
 unaryMinusTest(3);
 unaryMinusTest(3);
 %OptimizeFunctionOnNextCall(unaryMinusTest);
 unaryMinusTest(3);
 assertOptimized(unaryMinusTest);
 
 // Deopt on kMinInt
 unaryMinusTest(31);
 // The following is normally true, but not with --stress-opt. :-/
 // assertUnoptimized(unaryMinusTest);
 
 // We should have learned something from the deopt.
 unaryMinusTest(31);
 %OptimizeFunctionOnNextCall(unaryMinusTest);
 unaryMinusTest(31);
 assertOptimized(unaryMinusTest);