[llvm][MetadataLoader] Make sure we correctly load DW_APPLE_ENUM_KIND from bitcode

This was pointed out in
#124752 (comment)

There was not test that roundtrips this attribute through LLVM bitcode, so this was never caught.

Author: Michael137

llvm/lib/Bitcode/Reader/MetadataLoader.cpp

@@ -1704,8 +1704,8 @@ Error MetadataLoader::MetadataLoaderImpl::parseOneMetadata(
       }
     }
 
-    if (Record.size() > 25 && Record[25] != dwarf::DW_APPLE_ENUM_KIND_invalid)
-      EnumKind = Record[25];
+    if (Record.size() > 24 && Record[24] != dwarf::DW_APPLE_ENUM_KIND_invalid)
+      EnumKind = Record[24];
 
     DICompositeType *CT = nullptr;
     if (Identifier)

llvm/test/DebugInfo/AArch64/DW_AT_APPLE_enum_kind.ll

@@ -1,5 +1,6 @@
-; RUN: llc < %s -filetype=obj -o %t
-; RUN: llvm-dwarfdump -v %t | FileCheck %s
+; RUN: clang++ %s -c -g -emit-llvm -o %t.bc
+; RUN: llc %t.bc -filetype=obj -o %t.o
+; RUN: llvm-dwarfdump -v %t.o | FileCheck %s
 
 ; C++ source to regenerate:
 ; enum __attribute__((enum_extensibility(open))) OpenEnum {