mesa: Add new ir_unop_any() expression operation.

The previous any() implementation would generate arg0.x || arg0.y ||
arg0.z.  Having an expression operation for this makes it easy for the
backend to generate something easier (DPn + SNE for 915 FS, .any
predication on 965 VS)

src/glsl/ir_constant_expression.cpp

@@ -149,6 +149,15 @@ ir_expression::constant_expression_value()
       }
       break;
 
+   case ir_unop_any:
+      assert(op[0]->type->is_boolean());
+      data.b[0] = false;
+      for (unsigned c = 0; c < op[0]->type->components(); c++) {
+	 if (op[0]->value.b[c])
+	    data.b[0] = true;
+      }
+      break;
+
    case ir_unop_trunc:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
       for (unsigned c = 0; c < op[0]->type->components(); c++) {