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[HIP] Add option -fgpu-allow-device-init

Authored by yaxunl on Oct 22 2019, 10:41 AM.

Description

[HIP] Add option -fgpu-allow-device-init

Add this option to allow device side class type global variables
with non-trivial ctor/dtor. device side init/fini functions will
be emitted, which will be executed by HIP runtime when
the fat binary is loaded/unloaded.

This feature is to facilitate implementation of device side
sanitizer which requires global vars with non-trival ctors.

By default this option is disabled.

Differential Revision: https://reviews.llvm.org/D69268