stage2: comptime function with the same args is memoized

 * Introduce `memoized_calls` to `Module` which stores all the comptime
   function calls that are cached. It is keyed on the `*Fn` and the
   comptime arguments, but it does not yet properly detect comptime function
   pointers and avoid memoizing in this case. So it will have false
   positives for when a comptime function call mutates data through a
   pointer parameter.
 * Sema: Add a new helper function: `resolveConstMaybeUndefVal`
 * Value: add `enumToInt` method and use it in `zirEnumToInt`. It is
   also used by the hashing function.
 * Value: fix representation of optionals to match error unions.
   Previously it would not handle nested optionals correctly. Now it
   matches the memory layout of error unions and supports nested
   optionals properly. This required changes in all the backends for
   generating optional constants.
 * TypedValue gains `eql` and `hash` methods.
 * Value: Implement hashing for floats, optionals, and enums.
   Additionally, the zig type tag is added to the hash, where it was not
   previously, so that values of differing types will get different
   hashes.

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