John Brawn 8b954241f8 [GlobalMerge] Allow targets to enable merging of extern variables, NFC. ...

Adjust the GlobalMergeOnExternal option so that the default behaviour is to
do whatever the Target thinks is best. Explicitly enabled or disabling the
option will override this default.

Differential Revision: http://reviews.llvm.org/D10965

llvm-svn: 243873

2015-08-03 12:08:41 +00:00

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