Add an include guard for insns_info.inc

The JIT bindgens need this.

Author: XrXr

tool/ruby_vm/views/insns_info.inc.erb

@@ -11,6 +11,8 @@
   this_file: 'contains instruction information for yarv instruction sequence.',
   edit: __FILE__,
 } %>
+#ifndef INSNS_INFO_INC
+#define INSNS_INFO_INC 1
 <%= render 'insn_type_chars' %>
 <%= render 'insn_name_info' %>
 <%= render 'insn_len_info' %>
@@ -20,3 +22,4 @@
 <%= render 'zjit_helpers' %>
 <%= render 'attributes' %>
 <%= render 'comptime_insn_stack_increase' %>
+#endif