Revert r369458 "[DebugInfo] Add debug location to dynamic atexit destructor"

It causes the build to fail with

"inlinable function call in a function with debug info must have a !dbg location"

in Chromium. See llvm-commits thread for more info.

(This also reverts the follow-up in r369474.)

> Fixes PR43012
>
> Differential Revision: https://reviews.llvm.org/D66328

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@369633 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGDebugInfo.cpp

@@ -3564,8 +3564,7 @@ void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
   if (Name.startswith("\01"))
     Name = Name.substr(1);
 
-  if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>() ||
-      (isa<VarDecl>(D) && GD.getDynamicInitKind() == DynamicInitKind::AtExit)) {
+  if (!HasDecl || D->isImplicit() || D->hasAttr<ArtificialAttr>()) {
     Flags |= llvm::DINode::FlagArtificial;
     // Artificial functions should not silently reuse CurLoc.
     CurLoc = SourceLocation();

lib/CodeGen/CGDeclCXX.cpp

@@ -247,8 +247,6 @@ llvm::Function *CodeGenFunction::createAtExitStub(const VarDecl &VD,
 
   CGF.StartFunction(GlobalDecl(&VD, DynamicInitKind::AtExit),
                     CGM.getContext().VoidTy, fn, FI, FunctionArgList());
-  // Emit an artificial location for this function.
-  auto AL = ApplyDebugLocation::CreateArtificial(CGF);
 
   llvm::CallInst *call = CGF.Builder.CreateCall(dtor, addr);
 

test/CodeGenCXX/debug-info-atexit-stub.cpp

@@ -1,20 +0,0 @@
-// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm %s -gcodeview -debug-info-kind=limited -o - | FileCheck %s
-
-struct a {
-  ~a();
-};
-template <typename b> struct c : a {
-  c(void (b::*)());
-};
-struct B {
-  virtual void e();
-};
-c<B> *d() { static c<B> f(&B::e); return &f; }
-
-// CHECK: define internal void @"??__Ff@?1??d@@YAPEAU?$c@UB@@@@XZ@YAXXZ"()
-// CHECK-SAME: !dbg ![[SUBPROGRAM:[0-9]+]] {
-// CHECK: call void @"??1?$c@UB@@@@QEAA@XZ"(%struct.c* @"?f@?1??d@@YAPEAU?$c@UB@@@@XZ@4U2@A"), !dbg ![[LOCATION:[0-9]+]]
-// CHECK-NEXT: ret void, !dbg ![[LOCATION]]
-// CHECK: ![[SUBPROGRAM]] = distinct !DISubprogram(name: "`dynamic atexit destructor for 'f'"
-// CHECK-SAME: flags: DIFlagArtificial
-// CHECK: ![[LOCATION]] = !DILocation(line: 0, scope: ![[SUBPROGRAM]])

test/CodeGenCXX/debug-info-global-ctor-dtor.cpp

@@ -30,24 +30,24 @@ A FooTpl<T>::sdm_tpl(sizeof(U) + sizeof(T));
 template A FooTpl<int>::sdm_tpl<int>;
 
 // CHECK-NOKEXT: !DISubprogram(name: "__cxx_global_var_init",{{.*}} line: 15,{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-NOKEXT: !DISubprogram(name: "__dtor_glob",{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-NOKEXT: !DISubprogram(name: "__dtor_glob",{{.*}} line: 15,{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
 // CHECK-NOKEXT: !DISubprogram(name: "__cxx_global_var_init.1",{{.*}} line: 16,{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
 // CHECK-NOKEXT: !DISubprogram(name: "__cxx_global_array_dtor",{{.*}} line: 16,{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-NOKEXT: !DISubprogram(name: "__dtor_array",{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-NOKEXT: !DISubprogram(name: "__dtor__ZZ3foovE4stat",{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-NOKEXT: !DISubprogram(name: "__dtor_array",{{.*}} line: 16,{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-NOKEXT: !DISubprogram(name: "__dtor__ZZ3foovE4stat",{{.*}} line: 19,{{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
 // CHECK-NOKEXT: !DISubprogram({{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
 
 // CHECK-KEXT: !DISubprogram({{.*}} DISPFlagLocalToUnit | DISPFlagDefinition
 
 // CHECK-MSVC: !DISubprogram(name: "`dynamic initializer for 'glob'",{{.*}} line: 15,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-MSVC: !DISubprogram(name: "`dynamic atexit destructor for 'glob'",{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-MSVC: !DISubprogram(name: "`dynamic atexit destructor for 'glob'",{{.*}} line: 15,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
 // CHECK-MSVC: !DISubprogram(name: "`dynamic initializer for 'array'",{{.*}} line: 16,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
 // CHECK-MSVC: !DISubprogram(name: "__cxx_global_array_dtor",{{.*}} line: 16,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-MSVC: !DISubprogram(name: "`dynamic atexit destructor for 'array'",{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-MSVC: !DISubprogram(name: "`dynamic atexit destructor for 'stat'",{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-MSVC: !DISubprogram(name: "`dynamic atexit destructor for 'array'",{{.*}} line: 16,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-MSVC: !DISubprogram(name: "`dynamic atexit destructor for 'stat'",{{.*}} line: 19,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
 
 // MSVC does weird stuff when templates are involved, so we don't match exactly,
 // but these names are reasonable.
 // FIXME: These should not be marked DISPFlagLocalToUnit.
 // CHECK-MSVC: !DISubprogram(name: "FooTpl<int>::`dynamic initializer for 'sdm_tpl<int>'",{{.*}} line: 29,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
-// CHECK-MSVC: !DISubprogram(name: "FooTpl<int>::`dynamic atexit destructor for 'sdm_tpl<int>'",{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition
+// CHECK-MSVC: !DISubprogram(name: "FooTpl<int>::`dynamic atexit destructor for 'sdm_tpl<int>'",{{.*}} line: 29,{{.*}}: DISPFlagLocalToUnit | DISPFlagDefinition