Simplify AstExpression::compare

...to only work with LONG values, as it is only used to compare enumerator
values.  (But keep its general defensive-programming air that's so prevalent
across the idlc code base; not sure whether it could rightfully be tightened, or
whether this might be needed in parser's error recovery.)

Change-Id: I15f1700834f9397f3c2e0ffdb00e2abeecb734f9

idlc/inc/astexpression.hxx

@@ -114,8 +114,8 @@ public:
     // Evaluate then store value inside this AstExpression
     void evaluate();
 
-    // Compare to AstExpressions
-    bool compare(AstExpression *pExpr);
+    // Compare LONG AstExpression values
+    bool compareLong(AstExpression *pExpr);
 
     OString toString();
 private:

idlc/source/astenum.cxx

@@ -43,7 +43,7 @@ AstConstant* AstEnum::checkValue(AstExpression* pExpr)
         AstDeclaration* pDecl = *iter;
         AstConstant* pConst = static_cast<AstConstant*>(pDecl);
 
-        if (pConst->getConstValue()->compare(pExpr))
+        if (pConst->getConstValue()->compareLong(pExpr))
             return pConst;
 
         ++iter;

idlc/source/astexpression.cxx

@@ -758,7 +758,7 @@ bool AstExpression::coerce(ExprType t)
     return m_exprValue != nullptr;
 }
 
-bool AstExpression::compare(AstExpression *pExpr)
+bool AstExpression::compareLong(AstExpression *pExpr)
 {
     bool bRet = false;
     if (m_combOperator != pExpr->getCombOperator())
@@ -771,36 +771,9 @@ bool AstExpression::compare(AstExpression *pExpr)
         return bRet;
     switch (m_exprValue->et)
     {
-        case ET_short:
-            bRet = m_exprValue->u.sval == pExpr->getExprValue()->u.sval;
-            break;
-        case ET_ushort:
-            bRet = m_exprValue->u.usval == pExpr->getExprValue()->u.usval;
-            break;
         case ET_long:
             bRet = m_exprValue->u.lval == pExpr->getExprValue()->u.lval;
             break;
-        case ET_ulong:
-            bRet = m_exprValue->u.ulval == pExpr->getExprValue()->u.ulval;
-            break;
-        case ET_hyper:
-            bRet = m_exprValue->u.hval == pExpr->getExprValue()->u.hval;
-            break;
-        case ET_uhyper:
-            bRet = m_exprValue->u.uhval == pExpr->getExprValue()->u.uhval;
-            break;
-        case ET_float:
-            bRet = m_exprValue->u.fval == pExpr->getExprValue()->u.fval;
-            break;
-        case ET_double:
-            bRet = m_exprValue->u.dval == pExpr->getExprValue()->u.dval;
-            break;
-        case ET_byte:
-            bRet = m_exprValue->u.byval == pExpr->getExprValue()->u.byval;
-            break;
-        case ET_boolean:
-            bRet = m_exprValue->u.lval == pExpr->getExprValue()->u.lval;
-            break;
         default:
             OSL_ASSERT(false);
             bRet = false;