Add support for disassembling WebAssembly opcodes.

Add support for disassembling WebAssembly opcodes.

include	* dis-asm.h: Add prototypes for wasm32 disassembler.

opcodes	* Makefile.am: Add wasm32-dis.c.
	* configure.ac: Add wasm32-dis.c to wasm32 target.
	* disassemble.c: Add wasm32 disassembler code.
	* wasm32-dis.c: New file.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* po/POTFILES.in: Regenerate.
	* po/opcodes.pot: Regenerate.

gas	* testsuite/gas/wasm32/allinsn.d: Adjust test for disassembler
	changes.
	* testsuite/gas/wasm32/disass.d: New test.
	* testsuite/gas/wasm32/disass.s: New test.
	* testsuite/gas/wasm32/disass-2.d: New test.
	* testsuite/gas/wasm32/disass-2.s: New test.
	* testsuite/gas/wasm32/reloc.d: Adjust test for changed reloc
	names.
	* testsuite/gas/wasm32/reloc.s: Update test for changed assembler
	syntax.
	* testsuite/gas/wasm32/wasm32.exp: Run new tests.  Expect allinsn
	test to succeed.