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[clang][driver][AIX] Add system libc++ header paths to driver

Authored by daltenty on Sep 14 2021, 3:05 PM.

Description

[clang][driver][AIX] Add system libc++ header paths to driver

This change adds the system libc++ header location to the driver. As well we define
the __LIBC_NO_CPP_MATH_OVERLOADS__ macro when using those headers, in order to suppress
conflicting C++ overloads in the system libc headers that were used by XL C++.

Reviewed By: ZarkoCA

Differential Revision: https://reviews.llvm.org/D109078