[RemoveDIs] Update syntax highlighting to include debug records (#93660)

This patch updates the emacs, vim, and vscode syntax highlighters to
recognize debug records.

llvm/utils/emacs/llvm-mode.el

@@ -87,6 +87,8 @@
    `(,(regexp-opt '("extractvalue" "insertvalue") 'symbols) . font-lock-keyword-face)
    ;; Metadata types
    `(,(regexp-opt '("distinct") 'symbols) . font-lock-keyword-face)
+   ;; Debug records
+   `(,(concat "#" (regexp-opt '("dbg_assign" "dbg_declare" "dbg_label" "dbg_value") 'symbols)) . font-lock-keyword-face)
    ;; Atomic memory ordering constraints
    `(,(regexp-opt '("unordered" "monotonic" "acquire" "release" "acq_rel" "seq_cst") 'symbols) . font-lock-keyword-face)
    ;; Fast-math flags

llvm/utils/vim/syntax/llvm.vim

@@ -36,6 +36,9 @@ syn keyword llvmStatement sle slt srem store sub switch trunc udiv ueq uge ugt
 syn keyword llvmStatement uitofp ule ult umax umin une uno unreachable unwind
 syn keyword llvmStatement urem va_arg xchg xor zext
 
+" Debug records.
+syn match llvmStatement /\v#dbg_(assign|declare|label|value)/
+
 " Keywords.
 syn keyword llvmKeyword
       \ acq_rel

llvm/utils/vscode/llvm/syntaxes/ll.tmLanguage.yaml

@@ -34,7 +34,8 @@ patterns:
     captures:
       1:
         name: storage.type.llvm
-  - match: "\\badd\\b|\
+  - match: "(?<=\\s|^)#dbg_(assign|declare|label|value)\\b|\
+            \\badd\\b|\
             \\baddrspacecast\\b|\
             \\balloca\\b|\
             \\band\\b|\