gdi32: Improve performance of common case of AlphaBlend

[Jeff Muizelaar]

This special cases the relatively common case of SourceConstantAlpha == 255
allowing us to eliminate 4 multiplications and 4 divisions.
---
 dlls/gdi32/dibdrv/primitives.c |   36 +++++++++++++++++++++++++++---------
 1 files changed, 27 insertions(+), 9 deletions(-)
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