[turbofan] Fix OSR into functions where the expression stack is not empty.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index c4258a387d1f4c9f48cc1ad6b839c551a78b7274..f5117f292a8cc300c98ec0273e40edb6f473fd7f 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -7,7 +7,6 @@
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
-#include "src/compiler/osr.h"
 #include "src/scopes.h"
 #include "src/x64/assembler-x64.h"
 #include "src/x64/macro-assembler-x64.h"
@@ -1179,10 +1178,8 @@ void CodeGenerator::AssemblePrologue() {
     // remaining stack slots.
     if (FLAG_code_comments) __ RecordComment("-- OSR entrypoint --");
     osr_pc_offset_ = __ pc_offset();
-    int unoptimized_slots =
-        static_cast<int>(OsrHelper(info()).UnoptimizedFrameSlots());
-    DCHECK(stack_slots >= unoptimized_slots);
-    stack_slots -= unoptimized_slots;
+    DCHECK(stack_slots >= frame()->GetOsrStackSlotCount());
+    stack_slots -= frame()->GetOsrStackSlotCount();
   }
 
   if (stack_slots > 0) {