[llvm-commits] [patch] Fix some tests when --disable-threads is used

[Dimitry Andric]

If you configure llvm with --disable-threads, the following tests will
always fail:

     LLVM-Unit :: VMCore/Release+Asserts/VMCoreTests/ValueMapTest/0.LocksMutex
     LLVM-Unit :: VMCore/Release+Asserts/VMCoreTests/ValueMapTest/1.LocksMutex
     LLVM-Unit :: VMCore/Release+Asserts/VMCoreTests/ValueMapTest/2.LocksMutex

This is because the tests attempt to acquire a mutex, and expect it to
fail, but all mutex functions simply return true when --disable-threads
is used.

Fix this by adding some #if guards around the tests.  While here, change
"#if ENABLE_THREADS" to "#if defined(ENABLE_THREADS) || ENABLE_THREADS
== 1", which works better when ENABLE_THREADS is not defined at all.
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