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[DWARF] Warn on and ignore ".file 0" for DWARF v4 and earlier.

Authored by probinson on Jun 21 2018, 9:42 AM.

Description

[DWARF] Warn on and ignore ".file 0" for DWARF v4 and earlier.

This had been messing with the directory table for prior versions, and
also could induce a crash when generating asm output.

llvm-svn: 335254

Details