[ubsan] Fix HeapObjectMatcher to avoid invalid casts.

src/compiler/js-intrinsic-lowering.cc

Index: src/compiler/js-intrinsic-lowering.cc
diff --git a/src/compiler/js-intrinsic-lowering.cc b/src/compiler/js-intrinsic-lowering.cc
index 2c86ab78c0a6f9c9b770abdf52d78b035fd7c8bf..b83c39bd9a2b8767f832fbdb9634e19d5716cf52 100644
--- a/src/compiler/js-intrinsic-lowering.cc
+++ b/src/compiler/js-intrinsic-lowering.cc
@@ -179,11 +179,12 @@ Reduction JSIntrinsicLowering::ReduceHeapObjectGetMap(Node* node) {
 
 Reduction JSIntrinsicLowering::ReduceIncrementStatsCounter(Node* node) {
   if (!FLAG_native_code_counters) return ChangeToUndefined(node);
-  HeapObjectMatcher<String> m(NodeProperties::GetValueInput(node, 0));
+  HeapObjectMatcher m(NodeProperties::GetValueInput(node, 0));
   if (!m.HasValue() || !m.Value().handle()->IsString()) {
     return ChangeToUndefined(node);
   }
-  SmartArrayPointer<char> name = m.Value().handle()->ToCString();
+  SmartArrayPointer<char> name =
+      Handle<String>::cast(m.Value().handle())->ToCString();
   StatsCounter counter(jsgraph()->isolate(), name.get());
   if (!counter.Enabled()) return ChangeToUndefined(node);