[PATCH] Add methods to get archive file name from member file

[Shankar Kalpathi Easwaran]

================
Comment at: include/lld/Core/File.h:65
@@ -62,1 +64,3 @@
+    return *new (_allocator) std::string(
+      (_archivePath + "(" + _path + ")").str());
   }
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ruiu wrote:
> shankarke wrote:
> > Could we cache this path. 
> We could, but the cache needs to be invalidated when _archivePath is updated. This is used only for logging and debugging, I think we don't need to do that.
I dont think we ever update the archivePath after setting it. 

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Comment at: lib/ReaderWriter/FileArchive.cpp:206
@@ -205,3 +205,3 @@
     result = std::move(files[0]);
     if (std::error_code ec = result->parse())
       return ec;
----------------
There is still an issue that if there was a parse error, diagnostics will not show the proper error. Say the file was of a different architecture. I remember this was the reason I created ArchiveMemoryBuffer.

http://reviews.llvm.org/D7447

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