VM: [Kernel] Cherry-pick from dart-lang/kernel_sdk

runtime/vm/kernel_reader.h

Index: runtime/vm/kernel_reader.h
diff --git a/runtime/vm/kernel_reader.h b/runtime/vm/kernel_reader.h
index a361c141a5cb556da4daab29aa66f5d2d2f136f3..60c8de989380bf21f550a61cadb20c259a395aec 100644
--- a/runtime/vm/kernel_reader.h
+++ b/runtime/vm/kernel_reader.h
@@ -54,7 +54,7 @@ class Mapping {
 
 class KernelReader {
  public:
-  KernelReader(const uint8_t* buffer, intptr_t len, bool bootstrapping = false)
+  KernelReader(const uint8_t* buffer, intptr_t len)
       : thread_(dart::Thread::Current()),
         zone_(thread_->zone()),
         isolate_(thread_->isolate()),
@@ -64,7 +64,6 @@ class KernelReader {
         type_translator_(&translation_helper_,
                          &active_class_,
                          /*finalize=*/false),
-        bootstrapping_(bootstrapping),
         buffer_(buffer),
         buffer_length_(len) {}
 
@@ -122,8 +121,6 @@ class KernelReader {
   BuildingTranslationHelper translation_helper_;
   DartTypeTranslator type_translator_;
 
-  bool bootstrapping_;
-
   const uint8_t* buffer_;
   intptr_t buffer_length_;