Add Support for IAR compiler

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

Add support for IAR compiler. CMakeCCompilerId.c.in has such definition already

/* IAR Systems compiler for embedded systems.
   http://www.iar.com [^]
   Not supported yet by CMake
#elif defined(__IAR_SYSTEMS_ICC__)
# define COMPILER_ID "IAR" */

Mantis has more links and extensive discussion occurred.

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