Stop emitting the instructions INST_*_SCALAR_STK*.  They are identical to
their INST_*_STK* counterparts.
Having done that, it is clear the "simpleVarName" return from TclPushVarName
provides nothing of use to any of its callers.  Eliminate that.  Also make
TPVN return void, instead of int.
Bring the TPVN header comments up to date; they were quite rotten.
Fix C99 comment-ism breaking the native AIX compiler. HPUX likely as well.
3614102 - Reset stack housekeeping when compileProc fails.
Simplifications and tidying up of stack management issues.  Work in progress.
Corrected code generation when doing the second run with an 'infinite' loop.
Working towards the next batch of optimizations.
derp
Getting better at doing more efficient break/continue instruction handling.
Many improvements to code generation of efficient break and continue.
Remove useless macro, use existing macro where it makes sense.
Fix a stack depth calculation.
Generate [continue] optimally in [for] next clauses. Add tests for Bug 3614226.
Merge back the improved [break] and [continue] compilation.
merge back from trunk
Improve reliability of test httpold-4.12.  Thanks AF!
last-moment fix for FreeBSD from Pietro Cerutti
Next stage of fixing the break/continue generation.
fix for perf bug detected by Kieran (https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/vfpI3bc-DkQ)
fix for perf bug detected by Kieran (https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/vfpI3bc-DkQ)
merge 8.4