Convert the core lexer and parser into fully reentrant code, by making use

of features added to flex and bison since this code was originally written.
This change doesn't in itself offer any new capability, but it's needed
infrastructure for planned improvements in plpgsql.

Another feature now available in flex is the ability to make it use palloc
instead of malloc, so do that to avoid possible memory leaks.  (We should
at some point change the other lexers likewise, but this commit doesn't
touch them.)

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