[MemProf][NFC] Rename DefaultShadowGranularity to DefaultMemGranulari… #79412
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…ty in instrumentation code, be consistent with runtime
In runtime code, the size of memory block mapped to a single shadow location is called MEM_GRANULARITY.
In instrumentation code, the size of memory block mapped to a single shadow location is called DefaultShadowGranularity.
Actually, the SHADOW_GRANULARITY is 8 (1 << SHADOW_SCALE), and the MEM_GRANULARITY is 64.
The wording of DefaultShadowGranularity in instrumentation code is a bit misleading, this patch renames DefaultShadowGranularity to DefaultMemGranularity, be consistent with runtime.