Debug info: (bugfix) C++ C/Dtors can be compiled to multiple functions,
therefore, their declaration cannot have one DW_AT_linkage_name.
The specific instances however can and should have that attribute.

This patch reorders the code in DwarfUnit::getOrCreateSubprogramDIE()
to emit linkage names for C/Dtors.

rdar://problem/16362674.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206096 91177308-0d34-0410-b5e6-96231b3b80d8