Make the -L option for SaveTempLabels not be static. No functional change.

Note: This option name is terrible, we should fix this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208929 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Don't put fission type units in comdat sections.

Since type units in the dwo file are handled by a debug aware tool, they
don't need to leverage the ELF comdat grouping to implement
deduplication. Avoid creating all the .group sections for these as a
space optimization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208930 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused llvm namespace bool variable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208931 91177308-0d34-0410-b5e6-96231b3b80d8
Move more MC options into the MCTargetOptions structure.

No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208932 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Follow up to r208930, comment usage of 'using' to bring in base class overload.

Code review feedback from Eric Christopher.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208933 91177308-0d34-0410-b5e6-96231b3b80d8
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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208934 91177308-0d34-0410-b5e6-96231b3b80d8