[Simh] Simh execution speed improvement - about 45% improvement.

[Marc Chametzky]

> After that, I did compile simh to include the profiling code (by adding 
> –pg on the gcc command line).  After studying the profiling, I saw that 
> the functions that reads and writes to RAM and ROM are the ones that are 
> executed 50% of the time

> The solution is: by declaring those functions as inline!

On my Solaris 10 x64 (AMD Athlon 64 3200+) system, I was already 
building the VAX emulator in 64-bit mode using the Sun Studio 11 
compiler with the "-m64" switch, and with that, my CALCULATE_VUPS.COM 
procedure reported 38.0.

After making the changes to vax_cpu.c, and otherwise leaving everything 
else the same, I'm now getting 50.0, a 32% improvement.

Of course, running DCL scripts to approximate computing performance only 
gives a rough estimate, but it certainly appears that it's emulating the 
VAX more efficiently now.

--Marc