[turbofan] Enable DeoptFinallyReturn test that no longer fails.

This was fixed by 064be2385a and will no longer fail, even on the
no-snap ARM64 simulator.

R=bmeurer@chromium.org
TEST=cctest/test-run-jsexceptions/DeoptFinallyReturn

Review URL: https://codereview.chromium.org/979823002

Cr-Commit-Position: refs/heads/master@{#27005}

test/cctest/compiler/test-run-jsexceptions.cc

@@ -236,9 +236,7 @@ TEST(DeoptFinallyReturn) {
       "})";
   FunctionTester T(src);
 
-#if 0  // TODO(mstarzinger): Currently fails on no-snap AMR64 simulator.
   T.CheckCall(T.Val(2), T.Val(1));
-#endif
 }