Constant expressions with & ^ | && || and ?:
Patches behavior in the following Jacks tests: 15.28-primitive-13, -primitive-15, -primitive-17, -string-13, and -string-16.
Patches bugs 63, 64.
This patch does not address bug 65; another patch should be submitted with emitted bytecode optimizations for partially constant conditional expressions.
See the follow-on patch 120 - this patch caused a regression in 1.14.