Optimization of simple properties

[Jason House]

Last night I changed my code to expose raw variables instead of offering
properties.  The properties were simply returning a local variable.  I was
surprised that such a simple and stupid change resulted in a 10% speed up
for gdc-generated code.

Is this a bug unique to gdc (or the older gdc build that I have)? Is dmd
smart enough to avoid this kind of problem?