After switching over LLDB's line table parser to libDebugInfo, we noticed two regressions on the Windows bot. The problem is that when obtaining a file from the line table prologue, we append paths without specifying a path style. This leads to incorrect results on Windows for debug info containing Posix paths:
0x0000000000201000: /tmp\b.c, is_start_of_statement = TRUE
This patch is an attempt to fix that by guessing the path style whenever possible.