Pass PC offset into runtime when compiling for OSR.

src/mips/builtins-mips.cc

Index: src/mips/builtins-mips.cc
diff --git a/src/mips/builtins-mips.cc b/src/mips/builtins-mips.cc
index 1a5b3024c6067f94d9c48bedff451664a3fa4776..f27ded73480ceb38206d870741ec93b3ffdbb6c0 100644
--- a/src/mips/builtins-mips.cc
+++ b/src/mips/builtins-mips.cc
@@ -1000,13 +1000,22 @@ void Builtins::Generate_NotifyOSR(MacroAssembler* masm) {
 
 
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
-  // Lookup the function in the JavaScript frame and push it as an
-  // argument to the on-stack replacement function.
+  // Lookup the function in the JavaScript frame.
   __ lw(a0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
+    // Lookup and calculate pc offset.
+    __ lw(a1, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
+    __ lw(a2, FieldMemOperand(a0, JSFunction::kSharedFunctionInfoOffset));
+    __ lw(a2, FieldMemOperand(a2, SharedFunctionInfo::kCodeOffset));
+    __ Subu(a1, a1, Operand(Code::kHeaderSize - kHeapObjectTag));
+    __ Subu(a1, a1, a2);
+    __ SmiTag(a1);
+
+    // Pass both function and pc offset as arguments.
     __ push(a0);
-    __ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
+    __ push(a1);
+    __ CallRuntime(Runtime::kCompileForOnStackReplacement, 2);
   }
 
   // If the code object is null, just return to the unoptimized code.