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[CUDA] __global__ functions should always be visible externally.

Authored by tra on Sep 23 2015, 10:44 AM.

Description

[CUDA] global functions should always be visible externally.

Adjust global functions with DiscardableODR linkage to use
StrongODR linkage instead, so they are visible externally.

Differential Revision: http://reviews.llvm.org/D13067

llvm-svn: 248400