HLSL: Add template style constructors for vector & matrix types

Test/hlsl.templatetypes.negative.frag

@@ -0,0 +1,23 @@
+
+float PixelShaderFunction()
+{
+    // TODO: All of the below should fail, although presently the first failure
+    // aborts compilation and the rest are skipped.  Having a separate test for
+    // each would be cumbersome.
+
+    vector<void, 2>    r00;  // cannot declare vectors of voids
+    matrix<void, 2, 3> r01;  // cannot declare matrices of voids
+
+    vector<float, 2, 3> r02;  // too many parameters to vector
+    matrix<float, 2>    r03;  // not enough parameters to matrix
+
+    int three = 3;
+    vector<void, three> r04; // size must be a literal constant integer
+    matrix<void, three, three> r05; // size must be a literal constant integer
+
+    vector<vector<int, 3>, 3> r06;  // type must be a simple scalar
+    vector<float3, 3> r07;          // type must be a simple scalar
+
+    return 0.0;
+}
+