string.c: constify

* string.c (tr_find): constify argument table.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43699 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
hash.c: static internal functions

* hash.c (NOINSERT_UPDATE_CALLBACK): make both of noinsert and insert
  internal functions static.  and put semicolons for etags to find the
  following functions properly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43700 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
compile.c: tailcall on super

* compile.c (iseq_peephole_optimize): enable tail call optimization on
  super too.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43701 b2dd03c8-39d4-4d8f-98ff-823fe69b080e