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a38312a9a4
stl upper_bound method instead of lower_bound - we were failing to find some cached data in the L1 cache resulting in extra memory read packets while stepping. The bug with the existing code looked like this: If the L1 cache has 8 bytes at address 0x1000 and 8 bytes at address 0x2000 and we are searching for 4 bytes at 0x2004, the use of lower_bound would return the end() of the container and so we would incorrectly treat the memory as uncached. (the L1 cache is memory seeded from debugserver in the T aka questionmark packet, where debugserver will send up the stack memory that likely contains the caller's stack pointer and frame pointer values.) <rdar://problem/23869227> llvm-svn: 255421