[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 b57fef26f69effad369c89acb5f4dfd7545ab751..8c7aaee98b169a6e506df6298a320a5a73807c45 100644
--- a/runtime/vm/kernel_binary.cc
+++ b/runtime/vm/kernel_binary.cc
@@ -229,6 +229,7 @@ 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();
@@ -1806,6 +1807,7 @@ FunctionNode* FunctionNode::ReadFrom(Reader* reader) {
       static_cast<FunctionNode::AsyncMarker>(reader->ReadByte());
   function->type_parameters().ReadFrom(reader);
   function->required_parameter_count_ = reader->ReadUInt();
+  reader->ReadUInt();  // total parameter count.
   function->positional_parameters().ReadFromStatic<VariableDeclarationImpl>(
       reader);
   function->named_parameters().ReadFromStatic<VariableDeclarationImpl>(reader);