mjit_compile.inc.erb: ditto
common.mk: update dependency for the rename from getivar.erb

=== Optcarrot benchmark ===
```
$ benchmark-driver benchmark.yml --rbenv '2.0.0::2.0.0-p648 --disable-gems;before::before --disable-gems;before+JIT::before --disable-gems --jit;after::after --disable-gems;after+JIT::after --disable-gems --jit' -v --repeat-count 24
2.0.0: ruby 2.0.0p648 (2015-12-16 revision 53162) [x86_64-linux]
before: ruby 2.6.0dev (2018-10-14 trunk 65074) [x86_64-linux]
before+JIT: ruby 2.6.0dev (2018-10-14 trunk 65074) +JIT [x86_64-linux]
after: ruby 2.6.0dev (2018-10-14 trunk 65074) [x86_64-linux]
after+JIT: ruby 2.6.0dev (2018-10-14 trunk 65074) +JIT [x86_64-linux]
Calculating -------------------------------------
                              2.0.0      before  before+JIT       after   after+JIT
Optcarrot Lan_Master.nes     34.434      53.125      84.782      53.321      86.812 fps

Comparison:
             Optcarrot Lan_Master.nes
               after+JIT:        86.8 fps
              before+JIT:        84.8 fps - 1.02x  slower
                   after:        53.3 fps - 1.63x  slower
                  before:        53.1 fps - 1.63x  slower
                   2.0.0:        34.4 fps - 2.52x  slower
```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65076 b2dd03c8-39d4-4d8f-98ff-823fe69b080e