Add --check-code-pointer flag for debug builds

runtime/vm/assembler.cc

Index: runtime/vm/assembler.cc
diff --git a/runtime/vm/assembler.cc b/runtime/vm/assembler.cc
index 4e1eca9571f9bfabe28f598a098c2f6c30b4eece..f5358c1762eed9d2114885337939178f09a7fe13 100644
--- a/runtime/vm/assembler.cc
+++ b/runtime/vm/assembler.cc
@@ -13,6 +13,12 @@
 
 namespace dart {
 
+DECLARE_FLAG(bool, disassemble);
+DECLARE_FLAG(bool, disassemble_optimized);
+
+DEFINE_FLAG(bool, check_code_pointer, false,
+            "Verify instructions offset in code object."
+            "NOTE: This breaks the profiler.");
 DEFINE_FLAG(bool, code_comments, false,
             "Include comments into code and disassembly");
 #if defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_MIPS)
@@ -20,9 +26,6 @@ DEFINE_FLAG(bool, use_far_branches, false,
             "Enable far branches for ARM and MIPS");
 #endif
 
-DECLARE_FLAG(bool, disassemble);
-DECLARE_FLAG(bool, disassemble_optimized);
-
 static uword NewContents(intptr_t capacity) {
   Zone* zone = Thread::Current()->zone();
   uword result = zone->AllocUnsafe(capacity);