Don't cast out-of-enum-range -1 to CommonIntegralTypes

This fixes the following Clang 16 compilation error:
kdevelop/plugins/clang/duchain/cursorkindtraits.h:217:7: error: integer value -1 is outside the valid range of values [0, 255] for the enumeration type 'CommonIntegralTypes' [-Wenum-constexpr-conversion]
    : static_cast<IntegralType::CommonIntegralTypes>(-1);

Quote from llvm/llvm-project#59036 :
    The -Wenum-constexpr-conversion warning was created to account for
    the fact that casting integers to enums outside of the valid range
    of the enum is UB in C++17. Constant expressions invoking UB lead to
    an ill-formed program.

BUG: 471995
FIXED-IN: 5.12.230800

kdevplatform/language/duchain/types/integraltype.h

@@ -50,7 +50,8 @@ class KDEVPLATFORMLANGUAGE_EXPORT IntegralType
         TypeChar16_t,
         TypeChar32_t,
         TypeHalf,
-        TypeLanguageSpecific = 200
+        TypeLanguageSpecific = 200,
+        TypeNotIntegralType = 255
     };
 
     /// Default constructor

plugins/clang/duchain/builder.cpp

@@ -508,7 +508,7 @@ struct Visitor
         return context;
     }
 
-    template<CXTypeKind TK, EnableIf<CursorKindTraits::integralType(TK) != -1> = dummy>
+    template<CXTypeKind TK, EnableIf<CursorKindTraits::integralType(TK) != IntegralType::TypeNotIntegralType> = dummy>
     AbstractType *createType(CXType, CXCursor)
     {
         // TODO: would be nice to instantiate a ConstantIntegralType here and set a value if possible

plugins/clang/duchain/cursorkindtraits.h

@@ -214,7 +214,7 @@ constexpr IntegralType::CommonIntegralTypes integralType(CXTypeKind TK)
       ||TK == CXType_Char_S
       ||TK == CXType_UChar
       ||TK == CXType_SChar)     ?  IntegralType::TypeChar
-    : static_cast<IntegralType::CommonIntegralTypes>(-1);
+    : IntegralType::TypeNotIntegralType;
 }
 
 constexpr bool isArrayType(CXTypeKind TK)