[CMake] Strange options for Sun Studio compiler

[Doug Henry]

I noticed that the default options for build mode may be a bit strange for
sun compilers.  The release mode uses -xO2 and the minimum size mode uses
-xO3 (higher optimization level?).  There seems to be an option -xspace
which reads:

-xspace               Do not do optimizations that increase code size

However, I am not familiar with older versions of the sun compilers to know
if this option is available.
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