[patch] Handle MUST_NOT_THROW_EXPR in voidify_wrapper_expr.

[Torvald Riegel]

voidify_wrapper_expr didn't handle MUST_NOT_THROW_EXPR before, but was
used by the C++ side gimplify function for MUST_NOT_THROW_EXPR.  Handle
it like other wrappers which have the inner part in operand 0.

OK for trunk?
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commit 9cb965d2a5cf9ca6708ee85929784982253ded7a
Author: Torvald Riegel <triegel@redhat.com>
Date:   Mon Nov 21 00:25:08 2011 +0100

    Handle MUST_NOT_THROW_EXPR in voidify_wrapper_expr.
    
    	gcc/
    	* gimplify.c (voidify_wrapper_expr): Handle MUST_NOT_THROW_EXPR.

diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index cfe6696..2cd48de 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -1050,6 +1050,7 @@ voidify_wrapper_expr (tree wrapper, tree temp)
 	    case CLEANUP_POINT_EXPR:
 	    case TRY_FINALLY_EXPR:
 	    case TRY_CATCH_EXPR:
+	    case MUST_NOT_THROW_EXPR:
 	      TREE_SIDE_EFFECTS (*p) = 1;
 	      TREE_TYPE (*p) = void_type_node;
 	      p = &TREE_OPERAND (*p, 0);