Return true on success in cl::ExpandResponseFiles
Return true on success in cl::ExpandResponseFiles

This fixes a logic bug pointed out by Juraj Ivancic.

No behavior change because none of the in-tree clients of
cl::ExpandResponseFiles check the return value.  In this case, the
@prefixed arguments are left in the command line.  Downstream command
line processing has the opportunity to emit errors about it, so this
isn't that bad.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@196306 91177308-0d34-0410-b5e6-96231b3b80d8

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