[libFuzzer] Remove optimization flags for tests on Windows.

[mpividori]

Summary

I also remove the optimizations for Windows. I realize this was the reason of the failure in some tests.

[kcc]

LGTM

lib/Fuzzer/test/CMakeLists.txt

 # Build all these tests with -O0, otherwise optimizations may merge some
 # basic blocks and we'll fail to discover the targets.
 # We change the flags for every build type because we might be doing
 # a multi-configuration build (e.g. Xcode) where CMAKE_BUILD_TYPE doesn't
 # mean anything.
 set(variables_to_filter
   CMAKE_CXX_FLAGS_RELEASE
   CMAKE_CXX_FLAGS_DEBUG
   CMAKE_CXX_FLAGS_RELWITHDEBINFO
   CMAKE_CXX_FLAGS_MINSIZEREL
   LIBFUZZER_FLAGS_BASE
   )
 foreach (VARNAME ${variables_to_filter})
-  string(REPLACE " " ";" BUILD_FLAGS_AS_LIST "${${VARNAME}}")
-  set(new_flags "")
-  foreach (flag ${BUILD_FLAGS_AS_LIST})
-    # NOTE: Use of XX here is to avoid a CMake warning due to CMP0054
-    if (NOT ("XX${flag}" MATCHES "XX-O[0123s]"))
-      set(new_flags "${new_flags} ${flag}")
-    else()
-      set(new_flags "${new_flags} -O0")
-    endif()
-  endforeach()
-  set(${VARNAME} "${new_flags}")
+  string(REGEX REPLACE "([-/]O)[123s]" "\\10" ${VARNAME} "${${VARNAME}}")
 endforeach()
 
 # Enable the coverage instrumentation (it is disabled for the Fuzzer lib).
 set(CMAKE_CXX_FLAGS "${LIBFUZZER_FLAGS_BASE} -fsanitize-coverage=trace-pc-guard,indirect-calls,trace-cmp,trace-div,trace-gep -gline-tables-only")
 
 if(MSVC)
   # For tests use the CRT specified for release build
   # (asan doesn't support MDd and MTd)
target_link_libraries(LLVMFuzzer-DSOTest
   LLVMFuzzer
   )
 
 set_target_properties(LLVMFuzzer-DSOTest PROPERTIES RUNTIME_OUTPUT_DIRECTORY
   "${CMAKE_BINARY_DIR}/lib/Fuzzer/test")
 
 set_output_directory(LLVMFuzzer-DSO1
     BINARY_DIR "${CMAKE_BINARY_DIR}/lib/Fuzzer/test"
-    LIBRARY_DIR "${CMAKE_BINARY_DIR}/lib/Fuzzer/lib")
+    LIBRARY_DIR "${CMAKE_BINARY_DIR}/lib/Fuzzer/test")
 set_output_directory(LLVMFuzzer-DSO2
     BINARY_DIR "${CMAKE_BINARY_DIR}/lib/Fuzzer/test"
-    LIBRARY_DIR "${CMAKE_BINARY_DIR}/lib/Fuzzer/lib")
+    LIBRARY_DIR "${CMAKE_BINARY_DIR}/lib/Fuzzer/test")
 
 set(TestBinaries ${TestBinaries} LLVMFuzzer-DSOTest)
 
 ###############################################################################
 # Configure lit to run the tests
 #
 # Note this is done after declaring all tests so we can inform lit if any tests
 # need to be disabled.