[lldb-dev] [PATCH] Use 0 as LLDB_INVALID_LINE_NUMBER

[Andrew MacPherson]

gdb assumes that any debug entry with a line number of 0 means that line
number information is not available (see struct symtab_and_line here):

http://www.opensource.apple.com/source/gdb/gdb-967/src/gdb/symtab.h

lldb currently uses UINT32_MAX for the same thing.

I suggest changing lldb to use the same value as gdb so that it's possible
to mark line entry data as invalid in the same way for both debuggers.

Thanks,
Andrew
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