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, 1 insertions, 1 deletions

diff --git a/llvm/test/Assembler/invalid-mdcompileunit-null-file.ll b/llvm/test/Assembler/invalid-mdcompileunit-null-file.ll
index 613948f24ef..cc1892e9146 100644
--- a/llvm/test/Assembler/invalid-mdcompileunit-null-file.ll
+++ b/llvm/test/Assembler/invalid-mdcompileunit-null-file.ll
@@ -1,4 +1,4 @@
 ; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
 
 ; CHECK: <stdin>:[[@LINE+1]]:27: error: 'file' cannot be null
-!0 = !MDCompileUnit(file: null)
+!0 = !DICompileUnit(file: null)