[PATCH] Speed up target_read_string

[Luis Machado]

Hi,

The following change is aimed at increasing the performance of 
target_read_string for remote debugging. To accomplish that, the buffer 
has been increased to 64 bytes and we now use target_read_partial 
instead of target_read_memory.

The increase in the buffer size reduces the impact of the remote 
transfer overhead.

Luis
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