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When investigating various things, we often have a file offset and what to know what's in the PDB at that address. For example we may be doing a binary comparison of two LLD-generated PDBs to look for sources of non-determinism, or we may wish to compare an LLD-generated PDB with a Microsoft generated PDB for sources of byte-for-byte incompatibility. In these cases, we can do a binary diff of the two files, and once we find a mismatched byte we can use explain to figure out what that byte is, immediately honining in on the problem. This patch implements this by trying to narrow the meaning of a particular file offset down as much as possible. Differential Revision: https://reviews.llvm.org/D44959 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328799 91177308-0d34-0410-b5e6-96231b3b80d8
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