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/DebugInfo/X86/empty-array.ll b/llvm/test/DebugInfo/X86/empty-array.ll
index c65a3791f48..7c3cdc06742 100644
--- a/llvm/test/DebugInfo/X86/empty-array.ll
+++ b/llvm/test/DebugInfo/X86/empty-array.ll
@@ -30,7 +30,7 @@
 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 (trunk 169136)", isOptimized: false, emissionKind: FullDebug, file: !20, enums: !1, retainedTypes: !1, globals: !3, imports:  !1)
 !1 = !{}
 !3 = !{!5}
-!5 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "a", line: 1, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7))
+!5 = !DIGlobalVariable(name: "a", line: 1, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7)
 !6 = !DIFile(filename: "t.cpp", directory: "/Volumes/Sandbox/llvm")
 !7 = !DICompositeType(tag: DW_TAG_class_type, name: "A", line: 1, align: 32, file: !20, elements: !8)
 !8 = !{!9, !14}