[kernel] Stream everything. Replace .kernel_function with .kernel_offset

runtime/vm/kernel_binary.cc

Index: runtime/vm/kernel_binary.cc
diff --git a/runtime/vm/kernel_binary.cc b/runtime/vm/kernel_binary.cc
index dd791b1446b7002797268ef93d7bb737c5306198..690224221a32c6004fa61c4083e413d42539dd96 100644
--- a/runtime/vm/kernel_binary.cc
+++ b/runtime/vm/kernel_binary.cc
@@ -257,6 +257,7 @@ Typedef* Typedef::ReadFrom(Reader* reader) {
 Class* Class::ReadFrom(Reader* reader) {
   TRACE_READ_OFFSET();
 
+  kernel_offset_ = reader->offset() - 1;  // -1 to include tag byte.
   canonical_name_ = reader->ReadCanonicalNameReference();
   position_ = reader->ReadPosition(false);
   is_abstract_ = reader->ReadBool();
@@ -1843,6 +1844,7 @@ FunctionNode* FunctionNode::ReadFrom(Reader* reader) {
   function->dart_async_marker_ =
       static_cast<FunctionNode::AsyncMarker>(reader->ReadByte());
   function->type_parameters().ReadFrom(reader);
+  reader->ReadUInt();  // total parameter count.
   function->required_parameter_count_ = reader->ReadUInt();
   function->positional_parameters().ReadFromStatic<VariableDeclarationImpl>(
       reader);