Revert of GC plugin: consider references equal to raw pointers.

tools/clang/blink_gc_plugin/RecordInfo.cpp

Index: tools/clang/blink_gc_plugin/RecordInfo.cpp
diff --git a/tools/clang/blink_gc_plugin/RecordInfo.cpp b/tools/clang/blink_gc_plugin/RecordInfo.cpp
index 516a40a04daec50f420e1262ef2cff2d4a349202..3749594333c114bfa4a1895840a0712b10a9d813 100644
--- a/tools/clang/blink_gc_plugin/RecordInfo.cpp
+++ b/tools/clang/blink_gc_plugin/RecordInfo.cpp
@@ -592,9 +592,9 @@
     return 0;
   }
 
-  if (type->isPointerType() || type->isReferenceType()) {
+  if (type->isPointerType()) {
     if (Edge* ptr = CreateEdge(type->getPointeeType().getTypePtrOrNull()))
-      return new RawPtr(ptr, false, type->isReferenceType());
+      return new RawPtr(ptr, false);
     return 0;
   }
 
@@ -609,7 +609,7 @@
 
   if (Config::IsRawPtr(info->name()) && info->GetTemplateArgs(1, &args)) {
     if (Edge* ptr = CreateEdge(args[0]))
-      return new RawPtr(ptr, true, false);
+      return new RawPtr(ptr, true);
     return 0;
   }