[PATCH] [lsan] Enable i386 support. Also rework the lit test configs.

[Sergey Matveev]

Hi kcc, glider, samsonov,

RFC: what shall we do with this code? It seems to work, but the false
negatives are too rampant on i386 to have the tests enabled by default (there's
1 that is consistently reproducible and 3 flaky ones on top of that).

http://llvm-reviews.chandlerc.com/D1015

Files:
  lib/lsan/CMakeLists.txt
  lib/lsan/lit_tests/AsanConfig/lit.cfg
  lib/lsan/lit_tests/AsanConfig64/lit.site.cfg.in
  lib/lsan/lit_tests/LsanConfig/lit.site.cfg.in
  lib/lsan/lit_tests/CMakeLists.txt
  lib/lsan/lit_tests/LsanConfig/lit.cfg
  lib/lsan/lit_tests/LsanConfig32/lit.site.cfg.in
  lib/lsan/lit_tests/LsanConfig64/lit.site.cfg.in
  lib/lsan/lit_tests/AsanConfig/lit.site.cfg.in
  lib/lsan/lit_tests/TestCases/large_allocation_leak.cc
  lib/lsan/lit_tests/TestCases/use_registers.cc
  lib/lsan/lit_tests/lit.cfg
  lib/lsan/lit_tests/lit.common.cfg
  lib/lsan/lsan_allocator.cc
  lib/lsan/lsan_common.cc
  lib/lsan/lsan_common.h
  lib/lsan/lsan_interceptors.cc
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