MIPS/GAS/testsuite: Extend MIPS16 testing over multiple ISAs

MIPS/GAS/testsuite: Extend MIPS16 testing over multiple ISAs

Run the `mips16', `mips16-64', `mips16e-64', `mips16-macro',
`mips16-macro-e' and `mips16-macro-t' GAS tests over multiple MIPS16
ISAs.

	gas/
	* testsuite/gas/mips/mips16.d: Adjust test for multiple MIPS16
	ISA testing.
	* testsuite/gas/mips/mips16-64.d: Adjust test for multiple
	MIPS16 ISA testing.
	* testsuite/gas/mips/mips16e-64.d: Adjust test for multiple
	MIPS16 ISA testing.
	* testsuite/gas/mips/mips16-macro.d: Adjust test for multiple
	MIPS16 ISA testing.
	* testsuite/gas/mips/mips16e-64.s: Ensure MIPS16 ISA annotation.
	* testsuite/gas/mips/mips16e-64.l: Rename to...
	* testsuite/gas/mips/mips16e-32@mips16e-64.l: ... this.
	* testsuite/gas/mips/mips16-64@mips16.d: New test.
	* testsuite/gas/mips/mips16-64@mips16-64.d: New test.
	* testsuite/gas/mips/mips16e-32@mips16e-64.d: New test.
	* testsuite/gas/mips/mips16-32@mips16-macro.d: New test.
	* testsuite/gas/mips/mips16-64@mips16-macro.d: New test.
	* testsuite/gas/mips/mips16e-32@mips16-macro.d: New test.
	* testsuite/gas/mips/mips16-32@mips16-macro-e.d: New test.
	* testsuite/gas/mips/mips16e-32@mips16-macro-e.d: New test.
	* testsuite/gas/mips/mips16-32@mips16-macro-t.d: New test.
	* testsuite/gas/mips/mips16e-32@mips16-macro-t.d: New test.
	* testsuite/gas/mips/mips16e-32@mips16e-64.l: New stderr output.
	* testsuite/gas/mips/mips16-32@mips16-macro.l: New stderr
	output.
	* testsuite/gas/mips/mips16e-32@mips16-macro.l: New stderr
	output.
	* testsuite/gas/mips/mips16-32@mips16-macro-e.l: New stderr
	output.
	* testsuite/gas/mips/mips16e-32@mips16-macro-e.l: New stderr
	output.
	* testsuite/gas/mips/mips16-32@mips16-macro-t.l: New stderr
	output.
	* testsuite/gas/mips/mips16e-32@mips16-macro-t.l: New stderr
	output.
	* testsuite/gas/mips/mips.exp: Run `mips16', `mips16-64',
	`mips16-macro', `mips16-macro-t', `mips16-macro-e' and
	`mips16e-64' testing across multiple MIPS16 ISAs.  Fold
	`mips16-macro' and `mips16e-64' list test invocations into
	corresponding dump tests.