Drop x86_64 binutils <2.17 hack

X86.CodeGen.genSwitch contains this comment,

                 else -- HACK: On x86_64 binutils<2.17 is only able to generate
                      -- PC32 relocations, hence we only get 32-bit offsets in
                      -- the jump table. As these offsets are always negative
                      -- we need to properly sign extend them to 64-bit. This
                      -- hack should be removed in conjunction with the hack in
                      -- PprMach.hs/pprDataItem once binutils 2.17 is standard.

binutils 2.17 is now quite standard; even CentOS 5 shipped with 2.17. I think it is likely safe to remove this hack at this point.

Trac metadata

Trac field	Value
Version	8.0.1-rc2
Type	Task
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (NCG)
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