MAINT-1175: Reimplement LLTypeInfoLookup for better lookup failure.

The original LLTypeInfoLookup implementation was based on two assumptions:
small overall container size, and infrequent normal-case lookup failures.
Those assumptions led to binary-searching a sorted vector, with linear search
as a fallback to cover the problem case of two different type_info* values for
the same type. As documented in the Jira, this turned out to be a problem. The
container size was larger than expected, and failed lookups turned out to be
far more common than expected.
The new implementation is based on a hash map of std::type_info::name()
strings, which should perform equally well in the success and failure cases:
no special-case fallback logic.

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