MIPS16e2: Add new MIPS16e2 ASE binutils and GAS tests

Verify MIPS16e2 ASE instruction assembly, disassembly and object file
flags.

	binutils/
	* testsuite/binutils-all/mips/mips16-undecoded.d: Add `-mips3'
	to `as' flags.
	* testsuite/binutils-all/mips/mips16e2-undecoded.d: New test.
	* testsuite/binutils-all/mips/mips16e2-extend-insn.d: New test.
	* testsuite/binutils-all/mips/mips16-undecoded.s: Remove
	`.module mips3'.
	* testsuite/binutils-all/mips/mips.exp: Run the new tests.

	gas/
	* testsuite/gas/mips/mips16e2.d: New test.
	* testsuite/gas/mips/mips16e2-mt.d: New test.
	* testsuite/gas/mips/mips16e2-sub.d: New test.
	* testsuite/gas/mips/mips16e2@mips16e2-sub.d: New test.
	* testsuite/gas/mips/mips16e2-mt-sub.d: New test.
	* testsuite/gas/mips/mips16e2@mips16e2-mt-sub.d: New test.
	* testsuite/gas/mips/mips16e2-hilo.d: New test.
	* testsuite/gas/mips/mips16e2-hilo-n32.d: New test.
	* testsuite/gas/mips/mips16e2-reloc-error.d: New test.
	* testsuite/gas/mips/mips16e2-imm-error.d: New test.
	* testsuite/gas/mips/elf_ase_mips16e2.d: New test.
	* testsuite/gas/mips/elf_ase_mips16e2-2.d: New test.
	* testsuite/gas/mips/elf-rel9-mips16e2.d: New test.
	* testsuite/gas/mips/mips16e2-lui.d: New test.
	* testsuite/gas/mips/mips16e2@mips32r2-sync.d: New test.
	* testsuite/gas/mips/mips16e2@mips32r2-sync-1.d: New test.
	* testsuite/gas/mips/mips16e2@lui-2.d: New test.
	* testsuite/gas/mips/mips16e2-reloc-error.l: New stderr output.
	* testsuite/gas/mips/mips16e2-imm-error.l: New stderr output.
	* testsuite/gas/mips/mips16e2@lui-2.l: New stderr output.
	* testsuite/gas/mips/mips16e2.s: New test source.
	* testsuite/gas/mips/mips16e2-mt.s: New test source.
	* testsuite/gas/mips/mips16e2-sub.s: New test source.
	* testsuite/gas/mips/mips16e2-mt-sub.s: New test source.
	* testsuite/gas/mips/mips16e2-hilo.s: New test source.
	* testsuite/gas/mips/mips16e2-reloc-error.s: New test source.
	* testsuite/gas/mips/mips16e2-imm-error.s: New test source.
	* testsuite/gas/mips/elf-rel9-mips16e2.s: New test source.
	* testsuite/gas/mips/mips16e2-lui.s: New test source.
	* testsuite/gas/mips/mips.exp: Expand `mips32r2-sync',
	`mips32r2-sync-1', `lui-1' and `lui-2' tests across MIPS16e2
	architectures.  Run the new tests.