Add ir_loop to represent loops

This touches a lot of files because everything derived from ir_visitor
has to be updated.  This is the primary disadvantage of the visitor pattern.

1 files changed, 7 insertions, 0 deletions

diff --git a/ir_constant_folding.cpp b/ir_constant_folding.cpp
index af6674c3f6..d7efdecc45 100644
--- a/ir_constant_folding.cpp
+++ b/ir_constant_folding.cpp
@@ -145,3 +145,10 @@ ir_constant_folding_visitor::visit(ir_if *ir)
    visit_exec_list(&ir->then_instructions, this);
    visit_exec_list(&ir->else_instructions, this);
 }
+
+
+void
+ir_constant_folding_visitor::visit(ir_loop *ir)
+{
+   (void) ir;
+}