Move getLocStart() in Sema::ConvertArgumentsForCall

[Keno Fischer]

Sema::ConvertArgumentsForCall calls setNumArgs on the CallExpr. This
changes the result of getLocStart if the SourceLocation stored in the
CallExpr is invalid and in that case may lead to an assertion failure. This
quick patch fixes that.

I don't have commit access so let me know if anything else is needed.
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