look showed that the target's arch has no core / byte order and so when
AuxVector::AuxVector calls into a dataextractor and sets the byte size to 0,
it asserts. e.g.
m_arch = {
m_triple = (Data = "x86_64--linux", Arch = x86_64, SubArch = NoSubArch, Vendor = UnknownVendor, OS = Linux, Environment = UnknownEnvironment, ObjectFormat = ELF)
m_core = kCore_invalid
m_byte_order = eByteOrderInvalid
m_flags = 0x00000000
m_distribution_id = <no value available>
}
<rdar://problem/31380097>
llvm-svn: 299408
498ff61e2d