IR: Give 'DI' prefix to debug info metadata

Finish off PR23080 by renaming the debug info IR constructs from `MD*`
to `DI*`.  The last of the `DIDescriptor` classes were deleted in
r235356, and the last of the related typedefs removed in r235413, so
this has all baked for about a week.

Note: If you have out-of-tree code (like a frontend), I recommend that
you get everything compiling and tests passing with the *previous*
commit before updating to this one.  It'll be easier to keep track of
what code is using the `DIDescriptor` hierarchy and what you've already
updated, and I think you're extremely unlikely to insert bugs.  YMMV of
course.

Back to *this* commit: I did this using the rename-md-di-nodes.sh
upgrade script I've attached to PR23080 (both code and testcases) and
filtered through clang-format-diff.py.  I edited the tests for
test/Assembler/invalid-generic-debug-node-*.ll by hand since the columns
were off-by-three.  It should work on your out-of-tree testcases (and
code, if you've followed the advice in the previous paragraph).

Some of the tests are in badly named files now (e.g.,
test/Assembler/invalid-mdcompositetype-missing-tag.ll should be
'dicompositetype'); I'll come back and move the files in a follow-up
commit.

llvm-svn: 236120

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/test/CodeGen/Generic/dbg_value.ll b/llvm/test/CodeGen/Generic/dbg_value.ll
index 2ee667c3e02..4038086cbb4 100644
--- a/llvm/test/CodeGen/Generic/dbg_value.ll
+++ b/llvm/test/CodeGen/Generic/dbg_value.ll
@@ -4,11 +4,11 @@
 %0 = type { i32, i32 }
 
 define void @t(%0*, i32, i32, i32, i32) nounwind {
-  tail call void @llvm.dbg.value(metadata %0* %0, i64 0, metadata !0, metadata !MDExpression()), !dbg !MDLocation(scope: !MDSubprogram())
+  tail call void @llvm.dbg.value(metadata %0* %0, i64 0, metadata !0, metadata !DIExpression()), !dbg !DILocation(scope: !DISubprogram())
   unreachable
 }
 
 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
 
 ; !0 should conform to the format of DIVariable.
-!0 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "a", arg: 0, scope: !MDSubprogram())
+!0 = !DILocalVariable(tag: DW_TAG_arg_variable, name: "a", arg: 0, scope: !DISubprogram())