DebugInfo: Put concrete definitions referencing abstract definitions in the same scope as the abstract definition.

This seems like a simple cleanup/improved consistency, but also helps
lay the foundation to fix the bug mentioned in the test case: concrete
definitions preceeding any inlined usage aren't properly split into
concrete + abstract (because they're not known to need it until it's too
late).

Once we start deferring this choice until later, we won't have the
choice to put concrete definitions for inlined subroutines in a
different scope from concrete definitions for non-inlined subroutines
(since we won't know at time-of-construction which one it'll be). This
change brings those two cases into alignment ahead of that future
chaneg/fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209547 91177308-0d34-0410-b5e6-96231b3b80d8
Remove a confusing use of a static method.

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209548 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209550 91177308-0d34-0410-b5e6-96231b3b80d8
Test case comments. Fix sloppiness.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209551 91177308-0d34-0410-b5e6-96231b3b80d8