[PATCH] PR 17421: Implemented -save-temps={obj|cwd} option

[Artem Belevich]

Hi echristo,

-save-temps=cwd is equivalent to -save-temps   
-save-temps=obj saves temporary file in the same directory as output

This helps to avoid clobbering of temp files in case of parallel
compilation with -save-temps of the files that have the same name
but located in different directories.

http://reviews.llvm.org/D7304

Files:
  include/clang/Driver/Driver.h
  include/clang/Driver/Options.td
  lib/Driver/Driver.cpp
  lib/Driver/Tools.cpp
  test/Driver/save-temps.c

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