[PATCH 2/2] gold: Try to open the output file in incremental build.

[Mikolaj Zalewski]

  This patch adds the first check whether we can do an incremental
build - whether the output file exists. This is not done in a task but
in queue_initial_tasks as we can't proceed with any Read_symbols
before knowing from which files we want to read them, thus, AFAIK
there is no code to run in parallel with it.

2009-09-01  Mikolaj Zalewski  <mikolajz@google.com>

       * gold.cc (queue_initial_tasks): Call Inremental_inputs_checker methods.
       * incremental.cc
(Incremental_checker::can_incrementally_link_output_file): New method.
       * incremental.h (Incremental_checker): New class.
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