[turbofan] Remove the function reload hack for OSR.

src/compiler/linkage.cc

Index: src/compiler/linkage.cc
diff --git a/src/compiler/linkage.cc b/src/compiler/linkage.cc
index ea7b57f6144fcddbc1d6547092bb7ee5d0c4e191..48a1bb45376c236739c26434bdddd1ecff298ddd 100644
--- a/src/compiler/linkage.cc
+++ b/src/compiler/linkage.cc
@@ -345,10 +345,10 @@ CallDescriptor* Linkage::GetJSCallDescriptor(Zone* zone, bool is_osr,
 
   // The target for JS function calls is the JSFunction object.
   MachineType target_type = MachineType::AnyTagged();
-  // TODO(titzer): When entering into an OSR function from unoptimized code,
-  // the JSFunction is not in a register, but it is on the stack in an
-  // unaddressable spill slot. We hack this in the OSR prologue. Fix.
-  LinkageLocation target_loc = regloc(kJSFunctionRegister);
+  // When entering into an OSR function from unoptimized code the JSFunction
+  // is not in a register, but it is on the stack in the marker spill slot.
+  LinkageLocation target_loc = is_osr ? LinkageLocation::ForSavedCallerMarker()
+                                      : regloc(kJSFunctionRegister);
   return new (zone) CallDescriptor(     // --
       CallDescriptor::kCallJSFunction,  // kind
       target_type,                      // target MachineType