Implement preprocessor directive #ifndef #158
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To prevent redefinition or serving other purposes, we sometimes need to negate the result of
defined, however, currently shecc does support neither negation operator in macro scope, e.g.!defined(SOME_MACRO), nor#ifndef. Thus, in this PR, we introduce preprocessor directive#ifndefto solve this issue without massively refactoring frontend codebase (since frontend refactoring is WIP).