Add freeze keyword to IR emacs mode

Author: arsenm

llvm/utils/emacs/llvm-mode.el

@@ -64,7 +64,7 @@
    ;; Floating-point operators
    `(,(regexp-opt '("fadd" "fsub" "fneg" "fmul" "fdiv" "frem") 'symbols) . font-lock-keyword-face)
    ;; Special instructions
-   `(,(regexp-opt '("phi" "tail" "call" "select" "to" "shl" "lshr" "ashr" "fcmp" "icmp" "va_arg" "landingpad") 'symbols) . font-lock-keyword-face)
+   `(,(regexp-opt '("phi" "tail" "call" "select" "to" "shl" "lshr" "ashr" "fcmp" "icmp" "va_arg" "landingpad" "freeze") 'symbols) . font-lock-keyword-face)
    ;; Control instructions
    `(,(regexp-opt '("ret" "br" "switch" "invoke" "resume" "unwind" "unreachable" "indirectbr") 'symbols) . font-lock-keyword-face)
    ;; Memory operators