[PATCH] Driver: Replace switch cases with ifs.

[Rui Ueyama]

Hi shankarke,

We used to do like this instead of putting all command line processing
code within one gigantic switch statement. It is converted to a switch
in r188958, which introduced InputGraph.

Making bunch of ifs to one switch statement with bunch of cases weren't
needed for InputGraph, so I don't know why that change was made in the
first place.

In this patch I roll that change back. Now all "break"s are removed,
and the nesting is one level shallow.

http://reviews.llvm.org/D7478

Files:
  lib/Driver/WinLinkDriver.cpp

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