MIPS: Add Imagination interAptiv MR2 GAS test infrastructure

Define a new regular MIPS and MIPS16 interAptiv MR2 test architecture
and adjust existing tests now run against these architectures
accordingly.

This change causes new test failures:

FAIL: MIPS jal-svr4pic (interaptiv-mr2)
FAIL: MIPS jal-svr4pic noreorder (interaptiv-mr2)

with the `mips-sgi-irix5' and `mips-sgi-irix6' targets, which are
consistent with the remaining architecture results for these cases, that
do not take into account the lack of R_MIPS_JALR relocations produced by
GAS for these targets.  As a preexisting issue these failures are not
addressed with this change.

	gas/
	* testsuite/gas/mips/mips.exp (interaptiv-mr2): New architecture.
	(mips16e2-interaptiv-mr2): Likewise.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-macro.d: New
	test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-macro-t.d:
	New test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-macro-e.d:
	New test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-insn-t.d:
	New test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-insn-e.d:
	New test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16e-64.d: New
	test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-sub.d: New
	test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16e-sub.d: New
	test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16e-64-sub.d:
	New test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16e2-mt-sub.d:
	New test.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-asmacro.d:
	New test.
	* testsuite/gas/mips/interaptiv-mr2@mcu.d: New test.
	* testsuite/gas/mips/interaptiv-mr2@isa-override-1.d: New test.
	* testsuite/gas/mips/interaptiv-mr2@isa-override-2.d: New test.
	* testsuite/gas/mips/attr-gnu-4-5.d: Ignore any number of ASE
	flag lines present rather than just one.
	* testsuite/gas/mips/attr-gnu-4-6.d: Likewise.
	* testsuite/gas/mips/attr-gnu-4-7.d: Likewise.
	* testsuite/gas/mips/attr-none-o32-fp64-nooddspreg.d: Likewise.
	* testsuite/gas/mips/attr-none-o32-fp64.d: Likewise.
	* testsuite/gas/mips/attr-none-o32-fpxx.d: Likewise.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-macro.l: New
	stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-macro-t.l:
	New stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-macro-e.l:
	New stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-insn-t.l:
	New stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-insn-e.l:
	New stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16-sub.l: New
	stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16e-sub.l: New
	stderr output.
	* testsuite/gas/mips/mips16e2-interaptiv-mr2@mips16e-64-sub.l:
	New stderr output.
	* testsuite/gas/mips/interaptiv-mr2@isa-override-1.l: New stderr
	output.
	* testsuite/gas/mips/interaptiv-mr2@isa-override-2.l: New stderr
	output.