Enable texld instruction (shaders 1.4)

[Ivan Gyurdiev]

This patch enables the texld isntruction (v.1.4), currently marked 
incorrectly as requiring GLSL.
It also fixes its implementation to match msdn and other documentation.
Specifically, the texture stage matches the number of the destination 
register, not the source register.

Please apply after the reorganize patch from yesterday.

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