Reapply "Lazy deopt without code patching."

runtime/vm/code_patcher_arm.cc

Index: runtime/vm/code_patcher_arm.cc
diff --git a/runtime/vm/code_patcher_arm.cc b/runtime/vm/code_patcher_arm.cc
index 62775bf903be24e40288798cd397aefef32bcfbe..7640a5f25030a1db614c716a0493c2942072e227 100644
--- a/runtime/vm/code_patcher_arm.cc
+++ b/runtime/vm/code_patcher_arm.cc
@@ -30,10 +30,8 @@ void CodePatcher::PatchStaticCallAt(uword return_address,
 }
 
 
-void CodePatcher::InsertDeoptimizationCallAt(uword start, uword target) {
-  // The inserted call should not overlap the lazy deopt jump code.
-  ASSERT(start + CallPattern::DeoptCallPatternLengthInBytes() <= target);
-  CallPattern::InsertDeoptCallAt(start, target);
+void CodePatcher::InsertDeoptimizationCallAt(uword start) {
+  UNREACHABLE();
 }