[33b7abb8a2] [7174354ecb] Rewrite TclCompileThrowCmd().
Stack housekeeping repair for last checkin.
Repairs to compile/exec debugging output.
Select improvements in stack depth estimates brought over from mig-review.

Mostly these are just simplifications, removing code that wasn't needed.
Some changes make the stack depth estimate more accurate instruction by
instruction.
Code-readable disassembler: tcl::unsupported::getbytecode
merge trunk