extend rb_call_cache

Prior to this changeset, majority of inline cache mishits resulted
into the same method entry when rb_callable_method_entry() resolves
a method search.  Let's not call the function at the first place on
such situations.

In doing so we extend the struct rb_call_cache from 44 bytes (in
case of 64 bit machine) to 64 bytes, and fill the gap with
secondary class serial(s).  Call cache's class serials now behavies
as a LRU cache.

Calculating -------------------------------------
                           ours         2.7         2.6
vm2_poly_same_method     2.339M      1.744M      1.369M i/s - 6.000M times in 2.565086s 3.441329s 4.381386s

Comparison:
             vm2_poly_same_method
                ours:   2339103.0 i/s
                 2.7:   1743512.3 i/s - 1.34x  slower
                 2.6:   1369429.8 i/s - 1.71x  slower

1 files changed, 1 insertions, 1 deletions

diff --git a/tool/ruby_vm/loaders/insns_def.rb b/tool/ruby_vm/loaders/insns_def.rb
index a29d13a661..47e4ba29f5 100644
--- a/tool/ruby_vm/loaders/insns_def.rb
+++ b/tool/ruby_vm/loaders/insns_def.rb
@@ -21,7 +21,7 @@ grammar = %r'
     (?<keyword>  typedef | extern | static | auto | register |
                  struct  | union  | enum                           ){0}
     (?<C>        (?: \g<block> | [^{}]+ )*                         ){0}
-    (?<block>    \{ \g<ws>* ^ \g<C> $ \g<ws>* \}                   ){0}
+    (?<block>    \{ \g<ws>*   \g<C>   \g<ws>* \}                   ){0}
     (?<ws>       \g<comment> | \s                                  ){0}
     (?<ident>    [_a-zA-Z] [0-9_a-zA-Z]*                           ){0}
     (?<type>     (?: \g<keyword> \g<ws>+ )* \g<ident>              ){0}