struct: avoid all O(n) behavior on access

This avoids O(n) on lookups with structs over 10 members.
This also avoids O(n) behavior on all assignments on Struct members.
Members 0..9 still use existing C methods to read in O(1) time

Benchmark results:

vm2_struct_big_aref_hi*	1.305
vm2_struct_big_aref_lo*	1.157
vm2_struct_big_aset*	3.306
vm2_struct_small_aref*	1.015
vm2_struct_small_aset*	3.273

Note: I chose use loading instructions from an array instead of writing
directly to linked-lists in compile.c for ease-of-maintainability.  We
may move the method definitions to prelude.rb-like files in the future.

I have also tested this patch with the following patch to disable
the C ref_func methods and ensured the test suite and rubyspec works

	--- a/struct.c
	+++ b/struct.c
	@@ -209,7 +209,7 @@ setup_struct(VALUE nstr, VALUE members)
		ID id = SYM2ID(ptr_members[i]);
		VALUE off = LONG2NUM(i);

	-	if (i < N_REF_FUNC) {
	+	if (0 && i < N_REF_FUNC) {
		    rb_define_method_id(nstr, id, ref_func[i], 0);
		}
		else {

* iseq.c (rb_method_for_self_aref, rb_method_for_self_aset):
  new methods to generate bytecode for struct.c
  [Feature #10575]
* struct.c (rb_struct_ref, rb_struct_set): remove
  (define_aref_method, define_aset_method): new functions
  (setup_struct): use new functions
* test/ruby/test_struct.rb: add test for struct >10 members
* benchmark/bm_vm2_struct_big_aref_hi.rb: new benchmark
* benchmark/bm_vm2_struct_big_aref_lo.rb: ditto
* benchmark/bm_vm2_struct_big_aset.rb: ditto
* benchmark/bm_vm2_struct_small_aref.rb: ditto
* benchmark/bm_vm2_struct_small_aset.rb: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48748 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-10

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48749 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48750 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* test/net/http/test_https.rb
  (TestNetHTTPS#test_certificate_verify_failure): on Windows,
  Errno::ECONNRESET will be raised when the verify is failure at the
  client side, and it'll be eaten by WEBrick.

* test/open-uri/test_ssl.rb (TestOpenURISSL#test_validation_failure):
  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48751 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread.c: use the same method name

* thread.c (exec_recursive): use the same last method name as
  recursive_push in the error message when recursive_pop failed.
  [ruby-core:66742] [Bug #10579]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48752 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_cstr.rb: failed encoding name

* test/-ext-/string/test_cstr.rb (test_wchar_long): show the
  failed encoding name in error messages.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48753 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
struct.c: use iseqval

* struct.c (define_aref_method, define_aset_method): use iseq
  VALUE instead of rb_iseq_t to prevent from GC, as RB_GC_GUARD
  makes sense only for local variables.  [Feature #10575]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48754 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_cstr.rb: all wchar encodings

* test/-ext-/string/test_cstr.rb (assert_wchars_term_char): test
  for all wide char encodings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48755 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: chompped_length chomp_rs

* string.c (chompped_length, chomp_rs): extract from
  rb_str_chomp_bang to share with rb_str_chomp.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48756 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: local variables

* string.c (rb_str_plus, rb_str_splice_0): extract local
  variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48757 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_plus): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48758 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_times): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48759 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_chomp_bang): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48760 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_chop_bang): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48761 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_splice_0): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48762 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_sub_bang): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48763 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: term fill

* string.c (rb_str_delete_bang): fill wchar terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48764 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* vm_core.h: introduce new field
  rb_thread_t::local_storage_recursive_hash_for_trace to store
  recursive hash to avoid creating new recursive (nested) hashes
  for each trace events.
  [Bug #10511]
* vm_trace.c (rb_threadptr_exec_event_hooks_orig): use it.
* cont.c: catch up this fix.
* vm.c (rb_thread_mark): ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48765 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-11

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48766 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* lib/prime.rb: Remove useless loop and block capture.
  See [#10354]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48767 b2dd03c8-39d4-4d8f-98ff-823fe69b080e