[Patch]Enable double to float shrinking optimizations for binary functions like 'fmin/fmax'

[Yi Jiang]

Hi, 

This patch is to enable double to float shrinking optimizations for binary functions like 'fmin/fmax':
 fmin((double)floatval1, (double)floatval2) -> (double)fmin(floatval1, floatval2)

This patch will only cover fmin/fmax but the utility functions could allow us to add more functions in the future. Any comments will be highly appreciated.
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