[Utils] Add noundef attribute to vim/emacs/vscode syntax scripts

Differential Revision: https://reviews.llvm.org/D84553

llvm/utils/emacs/llvm-mode.el

@@ -25,7 +25,7 @@
        '("alwaysinline" "argmemonly" "builtin" "cold" "convergent" "inaccessiblememonly"
          "inaccessiblemem_or_argmemonly" "inlinehint" "jumptable" "minsize" "naked" "nobuiltin"
          "noduplicate" "noimplicitfloat" "noinline" "nonlazybind" "noredzone" "noreturn"
-         "norecurse" "nounwind" "optnone" "optsize" "readnone" "readonly" "returns_twice"
+         "norecurse" "noundef" "nounwind" "optnone" "optsize" "readnone" "readonly" "returns_twice"
          "speculatable" "ssp" "sspreq" "sspstrong" "safestack" "sanitize_address" "sanitize_hwaddress" "sanitize_memtag"
          "sanitize_thread" "sanitize_memory" "strictfp" "uwtable" "writeonly" "immarg") 'symbols) . font-lock-constant-face)
    ;; Variables

llvm/utils/vim/syntax/llvm.vim

@@ -119,6 +119,7 @@ syn keyword llvmKeyword
       \ norecurse
       \ noredzone
       \ noreturn
+      \ noundef
       \ nounwind
       \ optnone
       \ optsize

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

@@ -216,6 +216,7 @@ patterns:
             \\bnorecurse\\b|\
             \\bnoredzone\\b|\
             \\bnoreturn\\b|\
+            \\bnoundef\\b|\
             \\bnounwind\\b|\
             \\boptnone\\b|\
             \\boptsize\\b|\