Delete unused NameError#new. And add test.
OP_ENTER fix segmentation fault
Change to raise TypeError (Hash#merge, #merge!)
Merge pull request #2225 from ksss/proc-segv

OP_ENTER fix segmentation fault
Merge pull request #2226 from yui-knk/hash-merge-error

Change to raise TypeError (Hash#merge, #merge!)
Merge pull request #2223 from yui-knk/fix-nameerror

Delete unused NameError#new. And add test.