Simplify BlendFunc operator< judgement
Modify BlendFunc operator< judgement
Merge pull request #6938 from CaryZheng/v3

Simplify BlendFunc operator< judgement
fixed WP8 project:compile error,missing files,wrong file path.
Merge pull request #6990 from Dhilan007/v3-wp8fix

fixed WP8 project:compile error,missing files,wrong file path.