--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.amd64/src/org/graalvm/compiler/replacements/amd64/AMD64StringSubstitutions.java	2019-03-12 08:10:06.267772106 +0100
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.amd64/src/org/graalvm/compiler/replacements/amd64/AMD64StringSubstitutions.java	2019-03-12 08:10:05.907769775 +0100
@@ -82,7 +82,6 @@
             // The empty string contains nothing except the empty string.
             return -1;
         }
-        assert sourceCount - fromIndex > 0 && targetCount > 0;
 
         if (targetCount == 1) {
             Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED));