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Fix ARM/AArch64 Step-Over watchpoint issue remove provision for duplicate…

Description

Fix ARM/AArch64 Step-Over watchpoint issue remove provision for duplicate watchpoints

This patch fixes ARM/AArch64 watchpoint bug which was taking inferior out of control while stepping over watchpoints.
Also adds a test case that tests above problem.

Differential revision: https://reviews.llvm.org/D25057

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