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Because the parser has five stages, it requires instantiating all of the
templates in parsers.h with up to five different contexts. Instantiating all
those templates in a single compilation unit takes a long time. On my machine, a
release build of wat-parser.cpp.o took 32 seconds. To reduce the time of
incremental rebuilds on machines with many cores, split the code across several
compilation units so that the templates need to be instantiated for just a
single context in each unit. On my machine the longest compilation time after
this splitting is 17 seconds. The time for a full release build also drops from
42 seconds to 33 seconds. On machines with fewer cores, the benefit may be
smaller or even negative, though.
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