MIPS: Convert cross-mode BAL to JALX

Convert cross-mode regular MIPS and microMIPS BAL instructions to JALX,
similarly to how JAL instructions are converted.

	bfd/
	* elfxx-mips.c (mips_elf_perform_relocation): Convert cross-mode
	BAL to JALX.
	(_bfd_mips_elf_relocate_section) <bfd_reloc_outofrange>: Add a
	corresponding error message.

	gas/
	* config/tc-mips.c (mips_force_relocation, mips_fix_adjustable):
	Adjust comments for BAL to JALX linker conversion.
	(fix_bad_cross_mode_branch_p): Accept cross-mode BAL.
	* testsuite/gas/mips/unaligned-branch-1.l: Update error messages
	expected.
	* testsuite/gas/mips/unaligned-branch-micromips-1.l: Likewise.
	* testsuite/gas/mips/branch-local-4.d: New test.
	* testsuite/gas/mips/branch-local-n32-4.d: New test.
	* testsuite/gas/mips/branch-local-n64-4.d: New test.
	* testsuite/gas/mips/branch-addend.d: New test.
	* testsuite/gas/mips/branch-addend-n32.d: New test.
	* testsuite/gas/mips/branch-addend-n64.d: New test.
	* testsuite/gas/mips/branch-local-4.s: New test source.
	* testsuite/gas/mips/branch-addend.s: New test source.
	* testsuite/gas/mips/mips.exp: Run the new tests.

	ld/
	* testsuite/ld-mips-elf/unaligned-branch-2.d: Update error
	messages expected.
	* testsuite/ld-mips-elf/unaligned-branch-r6-1.d: Likewise.
	* testsuite/ld-mips-elf/unaligned-branch-mips16.d: Likewise.
	* testsuite/ld-mips-elf/unaligned-branch-micromips.d: Likewise.
	* testsuite/ld-mips-elf/bal-jalx-addend.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-local.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-pic.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-addend-n32.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-local-n32.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-pic-n32.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-addend-n64.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-local-n64.d: New test.
	* testsuite/ld-mips-elf/bal-jalx-pic-n64.d: New test.
	* testsuite/ld-mips-elf/unaligned-jalx-2.d: New test.
	* testsuite/ld-mips-elf/unaligned-jalx-3.d: New test.
	* testsuite/ld-mips-elf/unaligned-jalx-addend-2.d: New test.
	* testsuite/ld-mips-elf/unaligned-jalx-addend-3.d: New test.
	* testsuite/ld-mips-elf/unaligned-jalx-2.s: New test source.
	* testsuite/ld-mips-elf/unaligned-jalx-3.s: New test source.
	* testsuite/ld-mips-elf/unaligned-jalx-addend-2.s: New test
	source.
	* testsuite/ld-mips-elf/unaligned-jalx-addend-3.s: New test
	source.
	* testsuite/ld-mips-elf/mips-elf.exp: Run the new tests.