John Brawn f3324cf1a5 [ARM] Make GlobalMerge merge extern globals by default ...

Enabling merging of extern globals appears to be generally either beneficial or
harmless. On some benchmarks suites (on Cortex-M4F, Cortex-A9, and Cortex-A57)
it gives improvements in the 1-5% range, but in the rest the overall effect is
zero.

Differential Revision: http://reviews.llvm.org/D10966

llvm-svn: 243874

2015-08-03 12:13:33 +00:00

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