[PATCH] [mips][ias] Expand on r238751 to cover as many relocs as possible.

[Daniel Sanders]

Hi vkalintiris,

Relocs that can be converted from absolute to PC-relative now do so if IsPCRel
is true. Relocs that require PC-relative now call llvm_unreachable() if IsPCRel
is false and similarly those that require absolute assert that IsPCRel is false.

Note that while it looks like some relocs (e.g. R_MIPS_26) can be converted into
the MIPS32r6/MIPS64r6 relocs (R_MIPS_PC*_S2), it isn't actually valid to do so.

Placeholders have been left in the testcase for unsupported relocs and relocs
that cannot be generated at the moment.

http://reviews.llvm.org/D10184

Files:
  lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
  test/MC/Mips/mips-relocations.s
  test/MC/Mips/relocation.s

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