Add out-of-line constant pool support to Arm.

src/v8globals.h

Index: src/v8globals.h
diff --git a/src/v8globals.h b/src/v8globals.h
index 2e0ead3a795661dfb4fa01a89eb1e3f6d240a4f2..77a507d42bf6f4723dfe078dabdbdcdd56f1372e 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -238,7 +238,18 @@ struct CodeDesc {
   int buffer_size;
   int instr_size;
   int reloc_size;
+  int constant_pool_64bit_count;
+  int constant_pool_code_ptr_count;
+  int constant_pool_heap_ptr_count;
+  int constant_pool_32bit_count;
   Assembler* origin;
+
+  inline bool has_empty_constant_pool() const {
+    return constant_pool_64bit_count == 0 &&
+           constant_pool_code_ptr_count == 0 &&
+           constant_pool_heap_ptr_count == 0 &&
+           constant_pool_32bit_count == 0;
+  }
 };