LLD cherry-picks#26

Merged

dexonsmith merged 5 commits intoswiftlang:apple/stable/20190619from

compnerd:lld-is-link

Oct 27, 2019

Commits on Oct 26, 2019

Cleanup: llvm::bsearch -> llvm::partition_point after r364719

MaskRay
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compnerd
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[LLD][ELF] - Minor simplification. NFC.

George Rimar
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[DWARF][RISCV] Add support for RISC-V relocations needed for debug info

asb
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[MachO] Update LLD to use 64-bit offsets with DataExtractor (3/5)

igorkudrin
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[LLD] Move duplicated dwarf parsing code to the Common library. NFC.

mstorsjo
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