Added %NeverOptimize runtime call that can disable optimizations for a method for tests.

test/mjsunit/regress/regress-deopt-gcb.js

Index: test/mjsunit/regress/regress-deopt-gcb.js
diff --git a/test/mjsunit/regress/regress-deopt-gc.js b/test/mjsunit/regress/regress-deopt-gcb.js
similarity index 98%
copy from test/mjsunit/regress/regress-deopt-gc.js
copy to test/mjsunit/regress/regress-deopt-gcb.js
index a74e2c5ea44fa3eed0e05e3437ff440dfa71a74b..95bb450901c504062c49421c84d98b2d52a97d1e 100644
--- a/test/mjsunit/regress/regress-deopt-gc.js
+++ b/test/mjsunit/regress/regress-deopt-gcb.js
@@ -40,7 +40,7 @@ function opt_me() {
 
 function deopt() {
   // Make sure we don't inline this function
-  try { var a = 42; } catch(o) {};
+  %NeverOptimize();
   %DeoptimizeFunction(opt_me);
   gc();
 }