Pass PC offset into runtime when compiling for OSR.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 2c0cab0ce9f9a4aa5ed4be8cd60544d210d012ac..6a4cbd6ac76c702342fc9e1254b198e9df1604b5 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8583,8 +8583,21 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOptimizationCount) {
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
   HandleScope scope(isolate);
-  ASSERT(args.length() == 1);
+  ASSERT(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  CONVERT_NUMBER_CHECKED(uint32_t, pc_offset, Uint32, args[1]);
+
+#ifdef DEBUG
+  JavaScriptFrameIterator it(isolate);
+  JavaScriptFrame* frame = it.frame();
+  Handle<Code> unoptimized(function->shared()->code(), isolate);
+  ASSERT_EQ(frame->function(), *function);
+  ASSERT_EQ(frame->LookupCode(), *unoptimized);
+  ASSERT(unoptimized->contains(frame->pc()));
+
+  ASSERT(pc_offset ==
+         static_cast<uint32_t>(frame->pc() - unoptimized->instruction_start()));
+#endif  // DEBUG
 
   // We're not prepared to handle a function with arguments object.
   ASSERT(!function->shared()->uses_arguments());
@@ -8593,8 +8606,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
   // the unoptimized code can jump into.
   Handle<Code> code =
       (FLAG_concurrent_recompilation && FLAG_concurrent_osr)
-          ? Compiler::CompileForConcurrentOSR(function)
-          : Compiler::CompileForOnStackReplacement(function);
+          ? Compiler::CompileForConcurrentOSR(function, pc_offset)
+          : Compiler::CompileForOnStackReplacement(function, pc_offset);
   if (!code.is_null()) {
 #if DEBUG
     ASSERT(code->kind() == Code::OPTIMIZED_FUNCTION);