fix(debugger): a potential underflow in memory highlighting #6508
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Motivation
The debugger colors memory region for a variety of instructions that access the memory, as described in #5940. But there is a potential underflow if the size is 0 (where offset + size - 1 underflows).
Solution
Change to a simpler and more robust way to index the memory region.
Minor changes: Handle the potential out-of-bound access to the stack