John Brawn 0bef27d836 [GlobalMerge] Only emit aliases for internal linkage variables for non-Mach-O ...

On Mach-O emitting aliases for the variables that make up a MergedGlobals
variable can cause problems when linking with dead stripping enabled so don't
do that, except for external variables where we must emit an alias.

llvm-svn: 244748

2015-08-12 13:36:48 +00:00

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