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[OpenCL] Make global ctor init function a kernel

Authored by Anastasia on May 9 2019, 6:55 AM.

Description

[OpenCL] Make global ctor init function a kernel

We need to be able to enqueue internal function that initializes
global constructors on the host side. Therefore it has to be
converted to a kernel.

This change factors out common logic for adding kernel metadata
and moves it from CodeGenFunction to CodeGenModule in order to
make it accessible for the extra use case.

Differential revision: https://reviews.llvm.org/D61488

llvm-svn: 360342