Encode argument numbering in debug info so that code generator can emit them in order.
This fixes few blocks.exp regressions.

llvm-svn: 126960
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index a390788..2e0f719 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -181,7 +181,7 @@
   /// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
   /// variable declaration.
   void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
-                                CGBuilderTy &Builder);
+                                unsigned ArgNo, CGBuilderTy &Builder);
 
   /// EmitDeclareOfBlockLiteralArgVariable - Emit call to
   /// llvm.dbg.declare for the block-literal argument to a block
@@ -204,7 +204,7 @@
 private:
   /// EmitDeclare - Emit call to llvm.dbg.declare for a variable declaration.
   void EmitDeclare(const VarDecl *decl, unsigned Tag, llvm::Value *AI,
-                   CGBuilderTy &Builder);
+                   unsigned ArgNo, CGBuilderTy &Builder);
 
   /// EmitDeclare - Emit call to llvm.dbg.declare for a variable
   /// declaration from an enclosing block.