Preliminary implementation of JIT compilation for CompiledExpressions
JIT compilation uses optimized calculations for many of the most common operations
Added more optimized operations to JIT compilation
Added #ifdefs and CMake logic for deciding when to use JIT
Fixed compilation error on Linux
Fixed an illegal memory access
Do not use JIT compilation in 32 bit mode, since AsmJit currently doesn't support that properly
Added AsmJit to Licenses.txt
Merge pull request #630 from peastman/jit

JIT compilation for custom forces in CPU platform