[PATCH] Allow compiler-rt tests to be run on a simulator or remotely

[Greg Fitzgerald]

Fixed get_required_attr().  An empty string is a valid set of target_cflags.

http://reviews.llvm.org/D3425

Files:
  test/asan/CMakeLists.txt
  test/asan/lit.cfg
  test/asan/lit.site.cfg.in
  test/lit.common.cfg
  test/lit.common.configured.in
  test/lsan/lit.common.cfg
  test/profile/instrprof-basic.c
  test/profile/lit.cfg
  test/ubsan/lit.common.cfg
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