[GR-51285] Fix running protobuf on java -truffle in the default configuration.

PullRequest: graal/17429

Author: gilles-duboscq

espresso/src/com.oracle.truffle.espresso.libjavavm/src/com/oracle/truffle/espresso/libjavavm/LibEspresso.java

@@ -73,6 +73,7 @@ static int createJavaVM(@SuppressWarnings("unused") IsolateThread thread, JNIJav
         builder.option("java.ExitHost", "true");
         builder.option("java.EnableSignals", "true");
         builder.option("java.ExposeNativeJavaVM", "true");
+        builder.option("java.GuestFieldOffsetStrategy", "graal"); // most "hotspot-like"
         Context context = builder.build();
         context.enter();
         Value bindings;

espresso/src/com.oracle.truffle.espresso/src/com/oracle/truffle/espresso/substitutions/Target_sun_misc_Unsafe.java

@@ -232,7 +232,6 @@ public static final class SafetyGuestFieldOffsetStrategy implements GuestFieldOf
         public int guestOffsetToSlot(long guestOffset) {
             int offset = Math.toIntExact(guestOffset);
             if (forceStatic(offset)) {
-                assert offset >= (SAFETY_STATIC_FIELD_OFFSET - ALLOWED_HIDDEN_FIELDS) : "offset: " + offset;
                 return offset - SAFETY_STATIC_FIELD_OFFSET;
             } else {
                 return offset - SAFETY_FIELD_OFFSET;