[msan] Early allocator initialization.
Map MSan heap space early (in __msan_init) so that user code can not accidentally (i.e. w/o MAP_FIXED) create a conflicting mapping. llvm-svn: 248829
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Map MSan heap space early (in __msan_init) so that user code can not accidentally (i.e. w/o MAP_FIXED) create a conflicting mapping. llvm-svn: 248829