glsl2: Add and use new variable mode ir_var_temporary

This is quite a large patch because breaking it into smaller pieces
would result in the tree being intermitently broken.  The big changes
are:

    * Add the ir_var_temporary variable mode

    * Change the ir_variable constructor to take the mode as a
      parameter and correctly specify the mode for all ir_varables.

    * Change the linker to not cross validate ir_var_temporary
      variables.

    * Change the linker to pull all ir_var_temporary variables from
      global scope into 'main'.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/glsl/ir_if_to_cond_assign.cpp b/src/glsl/ir_if_to_cond_assign.cpp
index 274874bbb7..0b87413941 100644
--- a/src/glsl/ir_if_to_cond_assign.cpp
+++ b/src/glsl/ir_if_to_cond_assign.cpp
@@ -145,7 +145,8 @@ ir_if_to_cond_assign_visitor::visit_leave(ir_if *ir)
     * simpler.
     */
    cond_var = new(mem_ctx) ir_variable(glsl_type::bool_type,
-				       "if_to_cond_assign_condition");
+				       "if_to_cond_assign_condition",
+				       ir_var_temporary);
    ir->insert_before(cond_var);
 
    deref = new(mem_ctx) ir_dereference_variable(cond_var);