Fix chaining offset mis-calculation for translations w/ large switch statements.

Fix chaining offset mis-calculation for translations w/ large switch statements.

Bug: 2369821

There are 12 bytes of additional code after the 65th chaining cell. So if a
switch statement with more than that many cases is translated by the JIT, it
will run fine until the next unchaining event, which will patch the wrong code
and lead to all kinds of unexpected crashes.