Optimize count-leading-zero routines#591
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Use a logarithmic search to count leading zeros instead of using shift loops, dramatically reducing runtime when there are many leading zeros. Consolidated the routines for each integer type into a single source file due to their interdependencies.
Also, fix ez80_builtin function definitions to provide the same return type as their corresponding compiler built-ins, and optimize some routines to use count-leading-zeros instead of popcount.