i#1551 ARM: Generalize allasm-thumb.templatex to match variations.
i#1551 ARM: Generalize allasm-thumb.templatex to match variations.

Review-URL: https://codereview.appspot.com/296340043

AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio