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[AIX][Frontend] C++ ABI customizations for AIX boilerplate

Authored by Xiangling_L on Feb 24 2020, 6:46 AM.

Description

[AIX][Frontend] C++ ABI customizations for AIX boilerplate

This PR enables "XL" C++ ABI in frontend AST to IR codegen. And it is driven by
static init work. The current kind in Clang by default is Generic Itanium, which
has different behavior on static init with IBM xlclang compiler on AIX.

Differential Revision: https://reviews.llvm.org/D74015