Use safe hash functions for composite bitmaps

Previously the composite bitmap hash keys were compared and hashed
based on all the bytes in the struct, which could cause problems
because of padding bytes. Change the code to use field-by-field
operations as already done for other hash key types.

The composite hash key contains two bitmap hash keys. The hashing
function currently handles those by calling the function to calculate
the corresponding bitmap hash, and then updating the composite hash by
treating the result of the function call as a byte buffer. An
alternative would be to change the hash functions so that the initial
hash value could be passed as a parameter to the recursively called
function.

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