[tree-sra] Fix to set up correct context for call to compute_inline_parameter (PR44768)

Index: ipa-inline.c
===================================================================
--- ipa-inline.c	(revision 161901)
+++ ipa-inline.c	(working copy)
@@ -2019,7 +2019,7 @@  compute_inline_parameters (struct cgraph
 
   /* Estimate the stack size for the function.  But not at -O0
      because estimated_stack_frame_size is a quadratic problem.  */
-  self_stack_size = optimize ? estimated_stack_frame_size () : 0;
+  self_stack_size = optimize ? estimated_stack_frame_size (node->decl) : 0;
   inline_summary (node)->estimated_self_stack_size = self_stack_size;
   node->global.estimated_stack_size = self_stack_size;
   node->global.stack_frame_offset = 0;
Index: cfgexpand.c
===================================================================
--- cfgexpand.c	(revision 161901)
+++ cfgexpand.c	(working copy)
@@ -1252,8 +1252,8 @@  fini_vars_expansion (void)
   stack_vars_alloc = stack_vars_num = 0;
 }
 
-/* Make a fair guess for the size of the stack frame of the current
-   function.  This doesn't have to be exact, the result is only used
+/* Make a fair guess for the size of the stack frame of the decl
+   passed.  This doesn't have to be exact, the result is only used
    in the inline heuristics.  So we don't want to run the full stack
    var packing algorithm (which is quadratic in the number of stack
    vars).  Instead, we calculate the total size of all stack vars.
@@ -1261,12 +1261,15 @@  fini_vars_expansion (void)
    vars doesn't happen very often.  */
 
 HOST_WIDE_INT
-estimated_stack_frame_size (void)
+estimated_stack_frame_size (tree decl)
 {
   HOST_WIDE_INT size = 0;
   size_t i;
   tree var, outer_block = DECL_INITIAL (current_function_decl);
   unsigned ix;
+  tree old_cur_fun_decl = current_function_decl;
+  current_function_decl = decl;
+  push_cfun (DECL_STRUCT_FUNCTION (decl));
 
   init_vars_expansion ();
 
@@ -1287,7 +1290,8 @@  estimated_stack_frame_size (void)
       size += account_stack_vars ();
       fini_vars_expansion ();
     }
-
+  pop_cfun ();
+  current_function_decl = old_cur_fun_decl;
   return size;
 }
 
Index: tree-inline.h
===================================================================
--- tree-inline.h	(revision 161901)
+++ tree-inline.h	(working copy)
@@ -185,6 +185,6 @@  extern tree remap_decl (tree decl, copy_
 extern tree remap_type (tree type, copy_body_data *id);
 extern gimple_seq copy_gimple_seq_and_replace_locals (gimple_seq seq);
 
-extern HOST_WIDE_INT estimated_stack_frame_size (void);
+extern HOST_WIDE_INT estimated_stack_frame_size (tree);
 
 #endif /* GCC_TREE_INLINE_H */