commit 69e607f200faf0384a737bd8db69f29e51e1b378
author Adrian Prantl <aprantl@apple.com> Wed Aug 30 18:06:51 2017 +0000
committer Adrian Prantl <aprantl@apple.com> Wed Aug 30 18:06:51 2017 +0000
tree 2623b1ea8144906eaa3c8707e47d05fdf46b2783
parent ec6b6f4e7ad864820eb26875edf94f28c466e053

Canonicalize the representation of empty an expression in DIGlobalVariableExpression

This change simplifies code that has to deal with
DIGlobalVariableExpression and mirrors how we treat DIExpressions in
debug info intrinsics. Before this change there were two ways of
representing empty expressions on globals, a nullptr and an empty
!DIExpression().

If someone needs to upgrade out-of-tree testcases:
  perl -pi -e 's/(!DIGlobalVariableExpression\(var: ![0-9]*)\)/\1, expr: !DIExpression())/g' <MYTEST.ll>
will catch 95%.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312144 91177308-0d34-0410-b5e6-96231b3b80d8