Revert "[IR] Remove the DIExpression field from DIGlobalVariable."

This reverts commit 289920 (again).
I forgot to implement a Bitcode upgrade for the case where a DIGlobalVariable
has not DIExpression. Unfortunately it is not possible to safely upgrade
these variables without adding a flag to the bitcode record indicating which
version they are.
My plan of record is to roll the planned follow-up patch that adds a
unit: field to DIGlobalVariable into this patch before recomitting.
This way we only need one Bitcode upgrade for both changes (with a
version flag in the bitcode record to safely distinguish the record
formats).

Sorry for the churn!

llvm-svn: 289982

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/test/tools/llvm-objdump/X86/source-interleave-x86_64.ll b/llvm/test/tools/llvm-objdump/X86/source-interleave-x86_64.ll
index 63d11b339d0..09f16365fe4 100644
--- a/llvm/test/tools/llvm-objdump/X86/source-interleave-x86_64.ll
+++ b/llvm/test/tools/llvm-objdump/X86/source-interleave-x86_64.ll
@@ -46,7 +46,7 @@ attributes #1 = { nounwind readnone }
 !1 = !DIFile(filename: "source-interleave-x86_64.c", directory: "SRC_COMPDIR")
 !2 = !{}
 !3 = !{!4}
-!4 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "a", scope: !0, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true))
+!4 = distinct !DIGlobalVariable(name: "a", scope: !0, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true)
 !5 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
 !6 = !{i32 2, !"Dwarf Version", i32 4}
 !7 = !{i32 2, !"Debug Info Version", i32 3}