[arm64] Assembler support for internal references.

src/arm64/assembler-arm64.h

Index: src/arm64/assembler-arm64.h
diff --git a/src/arm64/assembler-arm64.h b/src/arm64/assembler-arm64.h
index 64103e3a6b8e95b35d7c9a114d94ed2596acc074..7e49a16567b6a957dafe1dae596e474098fb22c0 100644
--- a/src/arm64/assembler-arm64.h
+++ b/src/arm64/assembler-arm64.h
@@ -5,6 +5,7 @@
 #ifndef V8_ARM64_ASSEMBLER_ARM64_H_
 #define V8_ARM64_ASSEMBLER_ARM64_H_
 
+#include <deque>
 #include <list>
 #include <map>
 #include <vector>
@@ -1750,6 +1751,9 @@ class Assembler : public AssemblerBase {
   // Emit 64 bits of data in the instruction stream.
   void dc64(uint64_t data) { EmitData(&data, sizeof(data)); }
 
+  // Emit an address in the instruction stream.
+  void dcptr(Label* label);
+
   // Copy a string into the instruction stream, including the terminating NULL
   // character. The instruction pointer (pc_) is then aligned correctly for
   // subsequent instructions.
@@ -2166,6 +2170,10 @@ class Assembler : public AssemblerBase {
   // Each relocation is encoded as a variable size value
   static const int kMaxRelocSize = RelocInfoWriter::kMaxSize;
   RelocInfoWriter reloc_info_writer;
+  // Internal reference positions, required for (potential) patching in
+  // GrowBuffer(); contains only those internal references whose labels
+  // are already bound.
+  std::deque<int> internal_reference_positions_;
 
   // Relocation info records are also used during code generation as temporary
   // containers for constants and code target addresses until they are emitted