Make sure that any new and optimized objects created during GlobalOPT copy all the...

Make sure that any new and optimized objects created during GlobalOPT copy all the attributes from the base object.

Summary:
Make sure that any new and optimized objects created during GlobalOPT copy all the attributes from the base object.

A good example of improper behavior in the current implementation is section information associated with the GlobalObject. If a section was set for it, and GlobalOpt is creating/modifying a new object based on this one (often copying the original name), without this change new object will be placed in a default section, resulting in inappropriate properties of the new variable.
The argument here is that if customer specified a section for a variable, any changes to it that compiler does should not cause it to change that section allocation.
Moreover, any other properties worth representation in copyAttributesFrom() should also be propagated.

Reviewers: jmolloy, joker-eph, joker.eph

Subscribers: slarin, joker.eph, rafael, tobiasvk, llvm-commits

Differential Revision: http://reviews.llvm.org/D16074

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258556 91177308-0d34-0410-b5e6-96231b3b80d8