[turbofan] Add general support for sp-based frame access

src/compiler/linkage.h

Index: src/compiler/linkage.h
diff --git a/src/compiler/linkage.h b/src/compiler/linkage.h
index 5d89d0c6b3d2afbd5012a277e1688361dfe60d79..bda13de4b912b970376e1038bfd99a178f3eb377 100644
--- a/src/compiler/linkage.h
+++ b/src/compiler/linkage.h
@@ -23,6 +23,7 @@ namespace compiler {
 
 const RegList kNoCalleeSaved = 0;
 
+class FrameAccessState;

[titzer, 2015/11/24 17:45:56]

I think you can drop this forward declaration now.

 class Node;
 class OsrHelper;
 
@@ -188,6 +189,10 @@ class CallDescriptor final : public ZoneObject {
   // Returns {true} if this descriptor is a call to a JSFunction.
   bool IsJSFunctionCall() const { return kind_ == kCallJSFunction; }
 
+  bool RequiresFrameAsIncoming() const {
+    return IsCFunctionCall() || IsJSFunctionCall();
+  }
+
   // The number of return values from this call.
   size_t ReturnCount() const { return machine_sig_->return_count(); }
 
@@ -348,12 +353,6 @@ class Linkage : public ZoneObject {
   bool ParameterHasSecondaryLocation(int index) const;
   LinkageLocation GetParameterSecondaryLocation(int index) const;
 
-  // Get the frame offset for a given spill slot. The location depends on the
-  // calling convention and the specific frame layout, and may thus be
-  // architecture-specific. Negative spill slots indicate arguments on the
-  // caller's frame.
-  FrameOffset GetFrameOffset(int spill_slot, Frame* frame) const;
-
   static int FrameStateInputCount(Runtime::FunctionId function);
 
   // Get the location where an incoming OSR value is stored.