[PATCH] [ASan] Fix leak tests on 64-bit targets other than x86-64 (take two)

[Jay Foad]

Hi kcc, samsonov, earthdok,

First, remove lit configuration that sets ASAN_OPTIONS to detect_leaks=1
because this is already the default when leak detection is supported.
This removes a bit of duplication between various lit.cfg files.

Second, add a new feature 'leak-detection' if we're targetting x86_64
(not i386) on Linux.

Third, change a couple of tests that need leak detection to require the
new 'leak-detection' feature.

http://reviews.llvm.org/D6396

Files:
  test/asan/TestCases/Linux/coverage-and-lsan.cc
  test/asan/TestCases/Linux/leak.cc
  test/asan/Unit/lit.site.cfg.in
  test/asan/lit.cfg
  test/lsan/lit.common.cfg
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