PR c/37743
	* c-common.c (c_common_nodes_and_builtins): When initializing
	c_uint{16,32,64}_type_node, also set corresponding
	uint{16,32,64}_type_node to the same value.

	* g++.dg/ext/builtin-bswap1.C: New test.
	* c-c++-common/pr37743.c: New test.

From-SVN: r207924