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compile.c: restore stack at return

• compile.c (iseq_compile_each0): restore the stack depth after
  return to the previous depth, to fix the stack depth at
  returning from rescue iseq. [ruby-core:82108] [Bug #13755]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59374 b2dd03c8-39d4-4d8f-98ff-823fe69b080e