Removed useless memcpy operations
Removed useless memcpy operations

Loading RGBA8 was apparently copying each
line "width" times, which is pretty bad.
Fixed that by removing the useless loop.

Change-Id: Icf38232e422eb33f77b9df499e4137ea8f53abd3
Reviewed-on: https://swiftshader-review.googlesource.com/3040
Tested-by: Alexis Hétu <1c7141772178a7e80858c3db5052b328076f08f4@google.com>
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader