`calling->cd` instead of `calling->ci`

`struct rb_calling_info::cd` is introduced and `rb_calling_info::ci`
is replaced with it to manipulate the inline cache of iseq while
method invocation process. So that `ci` can be acessed with
`calling->cd->ci`. It adds one indirection but it can be justified
by the following points:

1) `vm_search_method_fastpath()` doesn't need `ci` and also
`vm_call_iseq_setup_normal()` doesn't need `ci`. It means
reducing `cd->ci` access in `vm_sendish()` can make it faster.

2) most of method types need to access `ci` once in theory
so that 1 additional indirection doesn't matter.

1 files changed, 1 insertions, 1 deletions

diff --git a/vm_core.h b/vm_core.h
index 64ea673d77..77861372ff 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -278,7 +278,7 @@ union iseq_inline_storage_entry {
 };
 
 struct rb_calling_info {
-    const struct rb_callinfo *ci;
+    const struct rb_call_data *cd;
     const struct rb_callcache *cc;
     VALUE block_handler;
     VALUE recv;