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Prevent generation of dependency on _cxa_guard for static initialization

Authored by serge-sans-paille on May 14 2021, 2:45 AM.

Description

Prevent generation of dependency on _cxa_guard for static initialization

This fixes an issue introduced by https://reviews.llvm.org/D70662

Function-scope static initialization are guarded in C++, so we should probably
not use it because it introduces a dependency on __cxa_guard* symbols.
In the context of clang, libasan is linked statically, and it currently needs to
the odd situation where compiling C code with clang and asan requires -lstdc++

Differential Revision: https://reviews.llvm.org/D102475