In the BC image, 76% of all methods have no temps (excluding args).  So
maybe it will be worth it to put temp reservation/intialization into a
bytecode.
Note, this percentage is probably a little smaller in the standard
image, since in the BC image blocks have their own methods and these are
likely to not have temps.  

| methods |
methods _ CompiledMethod2 allInstances.
((methods count: [:m | m numExtraTemps = 0]) / methods size) asFloat
"->  0.764"