[GR-65416] Disable signal handling for compilation isolates

* The compilation isolates do not need or use signal handling.
* Otherwise it's very complicated to disable InstallSegfaultHandler
  for Truffle languages as it would get automatically enabled
  for the compilation isolate, due to -R:+EnableSignalHandling
  -R:+InstallSegfaultHandler passed when building Truffle language native images.

Author: eregon

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/SubstrateSegfaultHandler.java

@@ -129,7 +129,7 @@ private static boolean isFirst() {
 public abstract class SubstrateSegfaultHandler {
     public static class Options {
         @Option(help = "Install segfault handler that prints register contents and full Java stacktrace. Default: enabled for an executable, disabled for a shared library, disabled when EnableSignalHandling is disabled.")//
-        static final RuntimeOptionKey<Boolean> InstallSegfaultHandler = new RuntimeOptionKey<>(null);
+        public static final RuntimeOptionKey<Boolean> InstallSegfaultHandler = new RuntimeOptionKey<>(null);
     }
 
     private static final long MARKER_VALUE = 0x0123456789ABCDEFL;

substratevm/src/com.oracle.svm.graal/src/com/oracle/svm/graal/isolated/IsolatedGraalUtils.java

@@ -27,6 +27,7 @@
 import java.lang.reflect.Array;
 import java.nio.ByteBuffer;
 
+import com.oracle.svm.core.SubstrateSegfaultHandler;
 import org.graalvm.collections.EconomicMap;
 import org.graalvm.nativeimage.CurrentIsolate;
 import org.graalvm.nativeimage.Isolates;
@@ -127,6 +128,10 @@ private static void appendOptionsRelevantForCompilationIsolates(CreateIsolatePar
 
         /* Compilation isolates do the reference handling manually to avoid the extra thread. */
         appendArgument(builder, SubstrateOptions.ConcealedOptions.AutomaticReferenceHandling, false);
+
+        /* Disable signal handling for compilation isolates. */
+        appendArgument(builder, SubstrateOptions.EnableSignalHandling, false);
+        appendArgument(builder, SubstrateSegfaultHandler.Options.InstallSegfaultHandler, false);
     }
 
     private static void appendOptionsExplicitlySetForCompilationIsolates(CreateIsolateParameters.Builder builder) {