Fix unreachable specializations

Author: DSouzaM

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ctypes/CFieldBuiltins.java

@@ -161,7 +161,7 @@ static void doit(VirtualFrame frame, CFieldObject self, Object inst, Object valu
             cDataSetNode.execute(frame, dst, self.proto, self.setfunc, value, self.index, self.size, dst.b_ptr.withOffset(self.offset));
         }
 
-        @Specialization(guards = "!isNoValue(value)")
+        @Specialization(guards = "isNoValue(value)")
         @InliningCutoff
         static void doit(CFieldObject self, Object inst, Object value,
                         @Cached PRaiseNode raiseNode) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/str/StringNodes.java

@@ -168,21 +168,6 @@ static int doNativeCharSequence(PString x,
             return doString(materializeNode.execute(inliningTarget, x), codePointLengthNode);
         }
 
-        @Specialization(guards = {"x.isNativeCharSequence()", "x.isNativeMaterialized()"})
-        static int nativeString(PString x,
-                        @Shared @Cached TruffleString.CodePointLengthNode codePointLengthNode) {
-            return doString(x.getNativeCharSequence().getMaterialized(), codePointLengthNode);
-        }
-
-        @Specialization(guards = {"x.isNativeCharSequence()", "!x.isNativeMaterialized()"}, replaces = "nativeString", limit = "3")
-        static int nativeStringMat(@SuppressWarnings("unused") PString x,
-                        @Bind("this") Node inliningTarget,
-                        @Bind("x.getNativeCharSequence()") NativeCharSequence ncs,
-                        @CachedLibrary("ncs") InteropLibrary lib,
-                        @Cached CastToJavaIntExactNode castToJavaIntNode) {
-            return ncs.length(inliningTarget, lib, castToJavaIntNode);
-        }
-
         @Specialization
         @InliningCutoff
         static int doNativeObject(PythonNativeObject x,