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I'm reviving a patch from phabracator, https://reviews.llvm.org/D155905 which was approved but I wasn't thrilled with all the API I was adding to SBProcess for all of the address mask types / memory regions. In this update, I added enums to control type address mask type (code, data, any) and address space specifiers (low, high, all) with defaulted arguments for the most common case. This patch is also fixing a bug in the "addressable bits to address mask" calculation I added in AddressableBits::SetProcessMasks. If lldb were told that 64 bits are valid for addressing, this method would overflow the calculation and set an invalid mask. Added tests to check this specific bug while I was adding these APIs. rdar://123530562