HLSL holds the compare value in a separate intrinsic arg, but the AST wants
a vector including the cmp val, except in the 4-dim coord case, where it
doesn't fit and is in fact a separate AST parameter. This is awkward but
necessary, given AST semantics. In the process, a new vector is constructed
for the combined result, but this vector was not being given the correct
TType, so was causing some downstream troubles.
Now it is. A similar defect existed in OpTextureBias, and has also been
fixed.
Takes some pressure off of issue #304.
Structures don't inherit locations and then explicitly decorate
members with them, so removed this reason to have another instance
of a structure type.
Also, this allows turning on the error check for a failed assigment
when parsing.
This makes 39 HLSL tests have a working assignment that was previously
silently dropped, due to lack of this functionality.
