Ruby » Ruby master

Safe navigation operator

• compile.c (iseq_peephole_optimize): peephole optimization for
  branchnil jumps.
• compile.c (iseq_compile_each): generate save navigation operator
  code.
• insns.def (branchnil): new opcode to pop the tos and branch if
  it is nil.
• parse.y (NEW_QCALL, call_op, parser_yylex): parse token '.?'.
  [Feature #11537]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52214 b2dd03c8-39d4-4d8f-98ff-823fe69b080e