[LLVMdev] Propose change gnuplot options for small picture versions

[Vladimir Merzliakov]

> Change the "rotate by 90" xtics specification to just "rotate" which is
> equivalent. The "by <angle>" syntax is not acceptable for all output
> devices. Apparently the Sparc and x86 output devices (no color) don't 
> accept this, but should accept the plain "rotate".

Sorry, i must be more careful if i proposed patches. 

Vladimir