Another missing conv nop.

svn path=/trunk/mono/; revision=14265

mono/mini/inssel-long32.brg

@@ -503,6 +503,11 @@ lreg: OP_LCONV_TO_U8 (lreg) {
 	MONO_EMIT_UNALU (s, tree, OP_MOVE, state->reg2, state->left->reg2);
 }
 
+lreg: OP_LCONV_TO_I8 (lreg) {
+	MONO_EMIT_NEW_UNALU (s, OP_MOVE, state->reg1, state->left->reg1);
+	MONO_EMIT_UNALU (s, tree, OP_MOVE, state->reg2, state->left->reg2);
+}
+
 reg: OP_LCONV_TO_U (lreg) {
 	MONO_EMIT_UNALU (s, tree, OP_MOVE, state->reg1, state->left->reg1);
 }