gallium/tgsi: Move interpolation info from tgsi_declaration to a separate token.

Move Interpolate, Centroid and CylindricalWrap from tgsi_declaration
to a separate token -- they only make sense for FS inputs and we need
room for other flags in the top-level declaration token.
diff --git a/src/gallium/drivers/radeonsi/radeonsi_shader.c b/src/gallium/drivers/radeonsi/radeonsi_shader.c
index 6425c35..0e1a97b 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_shader.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_shader.c
@@ -199,7 +199,7 @@
 	LLVMValueRef attr_number = lp_build_const_int32(gallivm, input_index);
 
 	/* XXX: Handle all possible interpolation modes */
-	switch (decl->Declaration.Interpolate) {
+	switch (decl->Interp.Interpolate) {
 	case TGSI_INTERPOLATE_COLOR:
 		if (si_shader_ctx->rctx->rasterizer->flatshade)
 			intr_name = "llvm.SI.fs.interp.constant";
@@ -331,14 +331,14 @@
 			i = shader->ninput++;
 			shader->input[i].name = d->Semantic.Name;
 			shader->input[i].sid = d->Semantic.Index;
-			shader->input[i].interpolate = d->Declaration.Interpolate;
-			shader->input[i].centroid = d->Declaration.Centroid;
+			shader->input[i].interpolate = d->Interp.Interpolate;
+			shader->input[i].centroid = d->Interp.Centroid;
 			break;
 		case TGSI_FILE_OUTPUT:
 			i = shader->noutput++;
 			shader->output[i].name = d->Semantic.Name;
 			shader->output[i].sid = d->Semantic.Index;
-			shader->output[i].interpolate = d->Declaration.Interpolate;
+			shader->output[i].interpolate = d->Interp.Interpolate;
 			break;
 		}