Fix graph scheduling segfaults for CEntryPoints.

Author: christianhaeubl

substratevm/src/com.oracle.svm.hosted.foreign/src/com/oracle/svm/hosted/foreign/UpcallStub.java

@@ -218,9 +218,15 @@ public StructuredGraph buildGraph(DebugContext debug, AnalysisMethod method, Hos
             arguments.addFirst(returnBuffer);
         }
 
-        /* Transfers to the Java-side stub; note that exceptions should be handled there. */
+        /*
+         * Transfers to the Java-side stub; note that exceptions should be handled there. We
+         * explicitly disable inline for this call to prevent that operations floating to a point
+         * where the base registers are not initialized yet.
+         */
         arguments.addFirst(mh);
         InvokeWithExceptionNode returnValue = kit.createJavaCallWithException(CallTargetNode.InvokeKind.Static, highLevelStub, arguments.toArray(ValueNode.EMPTY_ARRAY));
+        returnValue.setUseForInlining(false);
+
         kit.exceptionPart();
         kit.append(new DeadEndNode());
         kit.endInvokeWithException();

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/cenum/CEnumCallWrapperMethod.java

@@ -101,7 +101,7 @@ private ValueNode createInvoke(AnalysisMethod method, HostedGraphKit kit, Analys
         if (method.getAnnotation(CEnumLookup.class) != null) {
             /* Call a method that converts the primitive value to a Java enum. */
             EnumInfo enumInfo = (EnumInfo) nativeLibraries.findElementInfo(returnType);
-            return CInterfaceEnumTool.singleton().createInvokeLookupEnum(kit, returnType, enumInfo, arg);
+            return CInterfaceEnumTool.singleton().createInvokeLookupEnum(kit, returnType, enumInfo, arg, true);
         } else if (method.getAnnotation(CEnumValue.class) != null) {
             /* Call a method that converts a Java enum to a primitive value. */
             ResolvedJavaType declaringType = method.getDeclaringClass();

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/code/CCallStubMethod.java

@@ -143,7 +143,7 @@ private ValueNode adaptReturnValue(AnalysisMethod method, NativeLibraries native
                         "Enum class %s needs a method that is annotated with @%s because it is used as the return type of a method annotated with @%s: %s.",
                         declaredReturnType, CEnumLookup.class.getSimpleName(), getCorrespondingAnnotationName(), getOriginal());
 
-        return CInterfaceEnumTool.singleton().createInvokeLookupEnum(kit, declaredReturnType, enumInfo, value);
+        return CInterfaceEnumTool.singleton().createInvokeLookupEnum(kit, declaredReturnType, enumInfo, value, true);
     }
 
     private EnumInfo getEnumInfo(NativeLibraries nativeLibraries, AnalysisType type, boolean isReturnType) {