* vm_insnhelper.c (vm_getivar): specify inline instead of static inline.

  vm_getivar is called by vm_call_ivar and vm_getinstancevariable.
  At least with GCC 4.8 and 5.3 on Linux, they are inlining it into
  vm_call_ivar but not vm_getinstancevariable.
  By `inline`, they correctly inline it and gains performance.

  Speedup ratio: compare with the result of `ruby 2.4.0dev (2016-04-23
  trunk 54727) [x86_64-linux]' (greater is better)
  name    built-ruby
  loop_whileloop       1.001
  vm1_ivar*            1.189
  vm1_ivar_set*        1.024

  Note tha `inline`'s meaning is different between old GCC
  and C99. Old GCC's inline means C99's extern inline.
  https://gcc.gnu.org/onlinedocs/gcc/Inline.html
  Since Ruby specify -std=iso9899:1999, it works like C99.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54728 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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