[llvm] r226937 - lit: Make MCJIT's supported arch check case insensitive

[Kuba Brecka]

Hi Reid,
I'm reverting the r226937 commit, because it causes all asan lit tests to
be skipped now, at least on OS X, see


http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA_check/981/consoleFull

    ...
    UNSUPPORTED: AddressSanitizer32 :: TestCases/no_asan_gen_globals.c (750
of 21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/null_deref.cc (751 of
21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/on_error_callback.cc (752
of 21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/partial_right.cc (753 of
21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/poison_partial.cc (754 of
21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/print_summary.cc (755 of
21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/printf-1.c (756 of 21897)
    UNSUPPORTED: AddressSanitizer32 :: TestCases/printf-2.c (757 of 21897)
    ...

because "HOST_OS" is no longer set, and in compiler-rt we depend on that
property being set, otherwise we skip all tests.

The revert is done in r226979.

Kuba
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