Fixes issue where if a line section doesn't start with a line number
then the addresses at the beginning of the section don't have line numbers.
For example, for a line section like this
```
  0001:00000010-00000014, line/column/addr entries = 1
     7 00000013 !
```
a line number wouldn't be found for addresses from 10 to 12.
This matches behavior when using the DIA SDK.
Differential Revision: https://reviews.llvm.org/D93306
						
					
				
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| CodeView | ||
| DWARF | ||
| GSYM | ||
| MSF | ||
| PDB | ||
| Symbolize | ||
| CMakeLists.txt | ||