[vm] Fix data race in Function::unoptimized_code (#61800)

Closes #61823

GitOrigin-RevId: 271acaa
Change-Id: I0d350dadb93f178edf4288b914dd3c8bf6936254
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/457660
Commit-Queue: Ryan Macnak <[email protected]>
Reviewed-by: Ryan Macnak <[email protected]>
Reviewed-by: Alexander Markov <[email protected]>

Author: Hassnaa9

runtime/vm/parser.cc

@@ -47,7 +47,6 @@ namespace dart {
 ParsedFunction::ParsedFunction(Thread* thread, const Function& function)
     : thread_(thread),
       function_(function),
-      code_(Code::Handle(zone(), function.unoptimized_code())),
       scope_(nullptr),
       regexp_compile_data_(nullptr),
       function_type_arguments_(nullptr),

runtime/vm/parser.h

@@ -71,7 +71,6 @@ class ParsedFunction : public ZoneAllocated {
   ParsedFunction(Thread* thread, const Function& function);
 
   const Function& function() const { return function_; }
-  const Code& code() const { return code_; }
 
   LocalScope* scope() const { return scope_; }
   void set_scope(LocalScope* scope) {
@@ -294,7 +293,6 @@ class ParsedFunction : public ZoneAllocated {
  private:
   Thread* thread_;
   const Function& function_;
-  Code& code_;
   LocalScope* scope_;
   RegExpCompileData* regexp_compile_data_;
   LocalVariable* function_type_arguments_;