HLSL: pass tessellation execution modes through to SPIR-V

The SPIR-V generator had assumed tessellation modes such as
primitive type and vertex order would only appear in tess eval
(domain) shaders.  SPIR-V allows either, and HLSL allows and
possibly requires them to be in the hull shader.

This change:

1. Passes them through for either tessellation stage, and,

2. Does not set up defaults in the domain stage for HLSl compilation,
to avoid conflicting definitions.

Test/baseResults/hlsl.hull.ctrlpt-1.tesc.out

@@ -1,6 +1,8 @@
 hlsl.hull.ctrlpt-1.tesc
 Shader version: 450
 vertices = 3
+vertex spacing = fractional_odd_spacing
+triangle order = cw
 0:? Sequence
 0:27  Function Definition: @main(struct-hs_in_t-vf31[3];u1; ( temp structure{ temp 3-component vector of float val})
 0:27    Function Parameters: 
@@ -200,6 +202,8 @@ Linked tessellation control stage:
 
 Shader version: 450
 vertices = 3
+vertex spacing = fractional_odd_spacing
+triangle order = cw
 0:? Sequence
 0:27  Function Definition: @main(struct-hs_in_t-vf31[3];u1; ( temp structure{ temp 3-component vector of float val})
 0:27    Function Parameters: 
@@ -402,6 +406,9 @@ vertices = 3
                               MemoryModel Logical GLSL450
                               EntryPoint TessellationControl 4  "main" 41 45 48 94 108 126
                               ExecutionMode 4 OutputVertices 3
+                              ExecutionMode 4 Triangles
+                              ExecutionMode 4 SpacingFractionalOdd
+                              ExecutionMode 4 VertexOrderCw
                               Name 4  "main"
                               Name 8  "hs_in_t"
                               MemberName 8(hs_in_t) 0  "val"