[Complexity] Optimize mctStereoIGF_dec_fx()
# Basic info This is a sub-task of issue #1009. # Bug description Various optimizations to mctStereoIGF_dec_fx(): * Replace costly divisions by shr - we only need to divide by 1 or 2 * Calculate constant value for shift outside a for loop # Ways to reproduce See commandlines in issue #1009
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