[ob] Don't set get_saved_register() in Arm

[Andrew Cagney]

Hello,

The attached eliminates the setting of get_saved_register() for the Arm. 
  Having tested it for be/le and -mthumb (without any regressions), and 
given that it eliminates a reference to a deprecated function, I figure 
it's pretty obvious :-)

committed,
Andrew
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