Fix passthru of non-float texture coordinates.
Fix passthru of non-float texture coordinates.

Bug 18962347

Change-Id: I8976c11ef5cc0b8aeb902414b2d36e0375c57747
Reviewed-on: https://swiftshader-review.googlesource.com/1861
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

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