In some places, Tcl_UtfPrev()/Tcl_UtfNext() is used traversing the individual bytes of a string searching for '(', ')', '::' or other single bytes. It is overkill to use Tcl_UtfPrev/Tcl_UtfNext for that, since those characters can only appear as their ASCII byte, not as any other sequence.

This effectively removes the last Tcl_UtfNext() call from the core, the only ones left are in tclTest.c for test commands. So the TclUtfNext() macro doesn't make sense any more.
Remove "register" keyword from many files.

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