Process ast_iteration_statement into ir_loop

This causes the following tests to pass:
     glslparsertest/shaders/dowhile.frag
     glslparsertest/shaders/while.frag
     glslparsertest/shaders/while1.frag
     glslparsertest/shaders/while2.frag

1 files changed, 2 insertions, 0 deletions

diff --git a/ast.h b/ast.h
index f73e74906f..ba500dc773 100644
--- a/ast.h
+++ b/ast.h
@@ -558,6 +558,8 @@ public:
 
    virtual void print(void) const;
 
+   virtual ir_rvalue *hir(exec_list *, struct _mesa_glsl_parse_state *);
+
    enum ast_iteration_modes {
       ast_for,
       ast_while,