MIPS/GAS/testsuite: Correct whitespace issues with Loongson tests

MIPS/GAS/testsuite: Correct whitespace issues with Loongson tests

Remove CR characters, trailing whitespace and space characters appearing
immediately before a tab character, and replace spaces with tabs, all
across Loongson GAS tests.

	gas/
	* testsuite/gas/mips/loongson-2e.d: Correct whitespace issues.
	* testsuite/gas/mips/loongson-2f.d: Likewise.
	* testsuite/gas/mips/loongson-2f-2.d: Likewise.
	* testsuite/gas/mips/loongson-2f-3.d: Likewise.
	* testsuite/gas/mips/loongson-3a.d: Likewise.
	* testsuite/gas/mips/loongson-3a-2.d: Likewise.
	* testsuite/gas/mips/loongson-2e.s: Likewise.
	* testsuite/gas/mips/loongson-2f.s: Likewise.
	* testsuite/gas/mips/loongson-2f-3.s: Likewise.
	* testsuite/gas/mips/loongson-3a.s: Likewise.
	* testsuite/gas/mips/loongson-3a-2.s: Likewise.