i#1551 ARM: In insert_reachable_cti, use BLX (register) and BX.
i#1551 ARM: In insert_reachable_cti, use BLX (register) and BX.

Instead of (MOV LR,#... and) MOV PC,R11 use BLX R11 or BX R11.

Review-URL: https://codereview.appspot.com/299280043

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