DebugInfo: Metadata constructs now start with DI*

LLVM r236120 renamed debug info IR constructs to use a `DI` prefix, now
that the `DIDescriptor` hierarchy has been gone for about a week.  This
commit was generated using the rename-md-di-nodes.sh upgrade script
attached to PR23080, followed by running clang-format-diff.py on the
`lib/` portion of the patch.

llvm-svn: 236121
diff --git a/clang/test/CodeGenCXX/debug-info-cxx1y.cpp b/clang/test/CodeGenCXX/debug-info-cxx1y.cpp
index cd75fcd..026be3d 100644
--- a/clang/test/CodeGenCXX/debug-info-cxx1y.cpp
+++ b/clang/test/CodeGenCXX/debug-info-cxx1y.cpp
@@ -1,17 +1,17 @@
 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm-only -std=c++14 -emit-llvm -g %s -o - | FileCheck %s
 
 // CHECK: [[EMPTY:![0-9]*]] = !{}
-// CHECK: !MDCompositeType(tag: DW_TAG_structure_type, name: "foo",
+// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "foo",
 // CHECK-SAME:             elements: [[EMPTY]]
 // FIXME: The context of this definition should be the CU/file scope, not the class.
-// CHECK: !MDSubprogram(name: "func", {{.*}} scope: !"_ZTS3foo"
+// CHECK: !DISubprogram(name: "func", {{.*}} scope: !"_ZTS3foo"
 // CHECK-SAME:          type: [[SUBROUTINE_TYPE:![0-9]*]]
 // CHECK-SAME:          isDefinition: true
 // CHECK-SAME:          declaration: [[FUNC_DECL:![0-9]*]]
-// CHECK: [[SUBROUTINE_TYPE]] = !MDSubroutineType(types: [[TYPE_LIST:![0-9]*]])
+// CHECK: [[SUBROUTINE_TYPE]] = !DISubroutineType(types: [[TYPE_LIST:![0-9]*]])
 // CHECK: [[TYPE_LIST]] = !{[[INT:![0-9]*]]}
-// CHECK: [[INT]] = !MDBasicType(name: "int"
-// CHECK: [[FUNC_DECL]] = !MDSubprogram(name: "func",
+// CHECK: [[INT]] = !DIBasicType(name: "int"
+// CHECK: [[FUNC_DECL]] = !DISubprogram(name: "func",
 // CHECK-SAME:                          scope: !"_ZTS3foo"
 // CHECK-SAME:                          type: [[SUBROUTINE_TYPE]]
 // CHECK-SAME:                          isDefinition: false