[ASan] create separate configs for running ASan lit tests in both 32- and 64-bit mode. Clean up RUN-lines in tests.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183498 91177308-0d34-0410-b5e6-96231b3b80d8
Drop support for 32-bit PowerPC in sanitizer tools.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183499 91177308-0d34-0410-b5e6-96231b3b80d8