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/CodeGen/debug-info-scope-file.c b/clang/test/CodeGen/debug-info-scope-file.c
index 74456a0..9706319 100644
--- a/clang/test/CodeGen/debug-info-scope-file.c
+++ b/clang/test/CodeGen/debug-info-scope-file.c
@@ -5,10 +5,10 @@
 
 // CHECK: ret void, !dbg [[F1_LINE:![0-9]*]]
 // CHECK: ret void, !dbg [[F2_LINE:![0-9]*]]
-// CHECK: [[F1:![0-9]*]] = !MDSubprogram(name: "f1",{{.*}} isDefinition: true
-// CHECK: [[F2:![0-9]*]] = !MDSubprogram(name: "f2",{{.*}} isDefinition: true
-// CHECK: [[F1_LINE]] = !MDLocation({{.*}}, scope: [[F1]])
-// CHECK: [[F2_LINE]] = !MDLocation({{.*}}, scope: [[F2]])
+// CHECK: [[F1:![0-9]*]] = !DISubprogram(name: "f1",{{.*}} isDefinition: true
+// CHECK: [[F2:![0-9]*]] = !DISubprogram(name: "f2",{{.*}} isDefinition: true
+// CHECK: [[F1_LINE]] = !DILocation({{.*}}, scope: [[F1]])
+// CHECK: [[F2_LINE]] = !DILocation({{.*}}, scope: [[F2]])
 
 void f1() {
 }