进行了优化，减少了上帝结构体的符号表占用

lib/core/Handles/HandlesIf.py

@@ -71,10 +71,8 @@ class IfHandle(BaseHandle):
         Gen = self.Trans.LlvmGen
         if hasattr(Gen, '_define_constants') and name in Gen._define_constants:
             return True
-        if name in self.Trans.SymbolTable:
-            info = self.Trans.SymbolTable[name]
-            if info.IsDefine:
-                return True
+        if self.Trans.SymbolTable.is_define(name):
+            return True
         platform_macros = self._get_platform_macros()
         return name in platform_macros
 
@@ -84,7 +82,7 @@ class IfHandle(BaseHandle):
             val = Gen._define_constants[name]
             if isinstance(val, (int, float)):
                 return val
-        if name in self.Trans.SymbolTable:
+        if self.Trans.SymbolTable.has(name):
             info = self.Trans.SymbolTable[name]
             if info.IsDefine:
                 val = info.DefineValue