* gas/mips/mips.exp: Run the new tests, below.

* gas/mips/elf_e_flags1.d, gas/mips/elf_e_flags2.d,
gas/mips/elf_e_flags3.d, gas/mips/elf_e_flags4.d: New files.
* gas/mips/elf_e_flags.c, gas/mips/elf_e_flags.s: New files.