SpeedTree Material No Longer Compiles With Texture Coordinate Node In BaseColor

If you open a material with the speedtree node plugged into WPO and then use a texture coordinate(index of 2) in base color the material will no longer compile properly.

The full error is "Error [SM5] Material.usf(898,19-52): error X3067: 'GetObjectWorldPosition': ambiguous function call"

Removing the speedtree node from WPO fixes the compilation error.

REGRESSION?
Yes

Worked 4.14.3 CL 3249277
Broken 4.15 CL 3258144

1. Open attached project
2. Open Broadleaf_Desktop_Billboard_Mat
3. Add texture coordinate node and set the coordinate index to 2
4. Plug into base color or something leading to base color

RESULT
The material returns the error " 'GetObjectWorldPosition' ambiguous function call.

EXPECTED
The material is able to compile correctly with the texture coordinate node.

Fix UE-51650

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