MIPS: Fix failing branch range checks for micromips.

MIPS: Fix failing branch range checks for micromips.

The current branch range tests assume that the MIPS branch instructions
have a 16 bit branch offset which is shifted by 2.  Unfortunately for microMIPS
this offset is shifted by 1 which reduces the branch range and caused the
branch-*.c tests to fail.

testsuite/
	* gcc.target/mips/branch-2.c: Change NOMIPS16 to NOCOMPRESSION.
	* gcc.target/mips/branch-3.c: Ditto
	* gcc.target/mips/branch-4.c: Ditto.
	* gcc.target/mips/branch-5.c: Ditto.
	* gcc.target/mips/branch-6.c: Ditto.
	* gcc.target/mips/branch-7.c: Ditto.
	* gcc.target/mips/branch-8.c: Ditto.
	* gcc.target/mips/branch-9.c: Ditto.
	* gcc.target/mips/branch-10.c: Ditto.
	* gcc.target/mips/branch-11.c: Ditto.
	* gcc.target/mips/branch-12.c: Ditto.
	* gcc.target/mips/branch-13.c: Ditto.
	* gcc.target/mips/umips-branch-5.c: New file.
	* gcc.target/mips/umips-branch-6.c: New file.
	* gcc.target/mips/umips-branch-7.c: New file.
	* gcc.target/mips/umips-branch-8.c: New file.
	* gcc.target/mips/umips-branch-9.c: New file.
	* gcc.target/mips/umips-branch-10.c: New file.
	* gcc.target/mips/umips-branch-11.c: New file.
	* gcc.target/mips/umips-branch-12.c: New file.
	* gcc.target/mips/umips-branch-13.c: New file.
	* gcc.target/mips/umips-branch-14.c: New file.
	* gcc.target/mips/umips-branch-15.c: New file.
	* gcc.target/mips/umips-branch-16.c: New file.
	* gcc.target/mips/branch-helper.h (OCCUPY_0x10000): New define.
	(OCCUPY_0xfffc): New define.

From-SVN: r225540