Revert "DWARF and unwind support for AOT assembly output."

runtime/vm/snapshot.h

Index: runtime/vm/snapshot.h
diff --git a/runtime/vm/snapshot.h b/runtime/vm/snapshot.h
index 8e387efee7447bb738d5f92419883f1826e21062..60516398218ac4ac0cf9fbc478a27c5b4ae63143 100644
--- a/runtime/vm/snapshot.h
+++ b/runtime/vm/snapshot.h
@@ -24,7 +24,6 @@ class Class;
 class ClassTable;
 class Closure;
 class Code;
-class Dwarf;
 class ExternalTypedData;
 class GrowableObjectArray;
 class Heap;
@@ -766,8 +765,10 @@ class AssemblyImageWriter : public ImageWriter {
  public:
   AssemblyImageWriter(uint8_t** assembly_buffer,
                       ReAlloc alloc,
-                      intptr_t initial_size);
-  void Finalize();
+                      intptr_t initial_size)
+      : ImageWriter(),
+        assembly_stream_(assembly_buffer, alloc, initial_size),
+        text_size_(0) {}
 
   virtual void WriteText(WriteStream* clustered_stream, bool vm);
   virtual intptr_t text_size() { return text_size_; }
@@ -775,9 +776,6 @@ class AssemblyImageWriter : public ImageWriter {
   intptr_t AssemblySize() const { return assembly_stream_.bytes_written(); }
 
  private:
-  void FrameUnwindPrologue();
-  void FrameUnwindEpilogue();
-  void WriteByteSequence(uword start, uword end);
   void WriteWordLiteralText(uword value) {
 // Padding is helpful for comparing the .S with --disassemble.
 #if defined(ARCH_IS_64_BIT)
@@ -790,7 +788,6 @@ class AssemblyImageWriter : public ImageWriter {
 
   WriteStream assembly_stream_;
   intptr_t text_size_;
-  Dwarf* dwarf_;
 
   DISALLOW_COPY_AND_ASSIGN(AssemblyImageWriter);
 };