Greg Clayton 902716728c Make sure that "add-dsym" can't crash us when using it. ...

I am fixing this by:
1 - make sure we aren't trying to set the symbol file for a module to the same thing it already has and leaving it alone if it is the same
2 - keep all old symbol files around in the module in case there are any outstanding type references

<rdar://problem/18029116>

llvm-svn: 233757

2015-03-31 21:01:48 +00:00

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