[wasm] Initial signal handler

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index fb860a8f5bed924036568ef78e9b084235577e49..0f9c739b8e0501d37e78af33953c54c0b313f090 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -14258,6 +14258,14 @@ void Code::InvalidateEmbeddedObjects() {
 
 
 void Code::Relocate(intptr_t delta) {
+  if (trap_handler::EnableTrapHandler() && is_wasm_code()) {
+    fprintf(stderr, "Relocating Wasm code from %p to %p\n",
+            instruction_start() - delta, instruction_start());
+    const int index = trap_handler_index()->value();
+    if (index >= 0) {
+      trap_handler::UpdateCodePointer(index, instruction_start());
+    }
+  }
   for (RelocIterator it(this, RelocInfo::kApplyMask); !it.done(); it.next()) {
     it.rinfo()->apply(delta);
   }