[PPC64][Linux] Watchpoint configuration for PPC64 (#185192)
On PPC64, SIGTRAP is delivered before the triggering instruction
completes. The previous implementation wrongly assumed that the
instruction gets executed and due to that qHostInfo has the wrong info,
causing the SingleStep being avoided on Linux for PPC64, and the
execution being stuck at the store instruction.
This patch corrects this, making watchpoint work.