[RFA v2] Change target_write_memory_blocks to use std::vector

[Simon Marchi]

On 2018-02-27 12:14 PM, Tom Tromey wrote:
> This changes target_write_memory_blocks to use std::vector, rather
> than VEC.  This allows the removal of some cleanups.
> 
> This version incorporates the additions that Simon made.
> 
> Regression tested by the buildbot.

Obviously ok on my side :)

Thanks, Simon