Jiangning Liu 932e1c3924 Implement global merge optimization for global variables.
This commit implements two command line switches -global-merge-on-external
and -global-merge-aligned, and both of them are false by default, so this
optimization is disabled by default for all targets.

For ARM64, some back-end behaviors need to be tuned to get this optimization
further enabled.

llvm-svn: 208934
2014-05-15 23:45:42 +00:00
..
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2014-04-11 22:27:58 +00:00
2014-04-14 12:59:52 +00:00
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