[lldb][debugserver] Max response size for qSpeedTest (#156099)

The qSpeedTest packet is used for experiments to determine the optimal
packet size for a given communication medium, e.g. to transfer 10MB of
memory, is it faster to send a hundred 100KB packets or ten 1MB packets.
It creates a packet of the requested size in a stack allocation, but is
not checking that its buffer is large enough for the requested size.

Change this allocation to be on heap, and impose a maximum size that can
be tested (4MB, for now).

rdar://158630250

0 files changed, 0 insertions, 0 deletions