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[AIX] ExternalSymbolSDNode lowering

Authored by Xiangling_L on Jan 7 2020, 7:53 AM.

Description

[AIX] ExternalSymbolSDNode lowering

For memcpy/memset/memmove etc., replace ExternalSymbolSDNode with a
MCSymbolSDNode, which have a prefix dot before function name as entry
point symbol.

Differential Revision: https://reviews.llvm.org/D70718