Bitcode: Enable single_source lit config

The compile_time collection fails for the bitcode tests because the test
executable name has no relation to the bitcode input.

Setting single_source=True is not enough to fix it, but at least it
stops lit from summing up the compile of every tests every time (which
slowed the testrunner noticably down).

llvm-svn: 295274

Author: MatzeB

Bitcode/CMakeLists.txt

@@ -15,4 +15,5 @@ if(TEST_SUITE_ENABLE_BITCODE_TESTS)
       add_subdirectory(simd_ops)
     endif()
   endif()
+  file(COPY lit.local.cfg DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
 endif()

Bitcode/lit.local.cfg

@@ -0,0 +1 @@
+config.single_source = True