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Recently problems have been discovered in the way we write the FPM (free page map). In order to fix this, we first need to establish a baseline about what a correct FPM looks like using an MSVC generated PDB, so that we can then make our own generated PDBs match. And in order to do this, the dumper needs a mode where it can dump an FPM so that we can write tests for it. This patch adds a command to dump the FPM, as well as a test against a known-good PDB. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309894 91177308-0d34-0410-b5e6-96231b3b80d8