[ruby/prism] Parse rescue modifier values as statementsHEADmaster

The value of a `rescue` modifier is a full `stmt` in the grammar in
three of its six productions, but we parsed it as a plain expression
in every case. This rejected valid syntax such as `a rescue b, c = 1`
and accepted invalid syntax such as `a = 1 rescue not b`.

These are the relevant grammar rules:

      stmt            : stmt modifier_rescue stmt
                      | mlhs '=' mrhs_arg modifier_rescue stmt
      command_rhs     : command_call_value modifier_rescue stmt
      arg_rhs         : arg modifier_rescue arg
      endless_arg     : endless_arg modifier_rescue arg
      endless_command : endless_command modifier_rescue arg

parse_rescue_modifier_value will now parse either a stmt or an arg
depending on the caller.

https://github.com/ruby/prism/commit/07e63f707f

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