glsl: parse align layout qualifier

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

src/compiler/glsl/ast.h

@@ -479,6 +479,12 @@ struct ast_type_qualifier {
 	 unsigned pixel_center_integer:1;
 	 /*@}*/
 
+         /**
+          * Flag set if GL_ARB_enhanced_layouts "align" layout qualifier is
+          * used.
+          */
+         unsigned explicit_align:1;
+
 	 /**
 	  * Flag set if GL_ARB_explicit_attrib_location "location" layout
 	  * qualifier is used.
@@ -577,6 +583,11 @@ struct ast_type_qualifier {
    /** Precision of the type (highp/medium/lowp). */
    unsigned precision:2;
 
+   /**
+    * Alignment specified via GL_ARB_enhanced_layouts "align" layout qualifier
+    */
+   ast_expression *align;
+
    /** Geometry shader invocations for GL_ARB_gpu_shader5. */
    ast_layout_expression *invocations;