[compiler-rt] Fix passing debug information to unittest.

[etienneb]

Summary

On windows, the debug information was not present in the unittest executables,
which make them hard to debug.

The Sanitizer Unittests are compiled with a local clang build.
The link pass is also done by calling clang.

This pass is adding the appropriate flags to bring the right debug information
to these executables.

[rnk]

lgtm

lib/asan/tests/CMakeLists.txt

set(ASAN_UNITTEST_COMMON_LINKFLAGS
   ${COMPILER_RT_UNITTEST_LINKFLAGS})
 
 # -gline-tables-only must be enough for ASan, so use it if possible.
 if(COMPILER_RT_TEST_COMPILER_ID MATCHES "Clang")
   list(APPEND ASAN_UNITTEST_COMMON_CFLAGS -gline-tables-only)
 else()
   list(APPEND ASAN_UNITTEST_COMMON_CFLAGS -g)
 endif()
+if(MSVC)
+  list(APPEND SANITIZER_TEST_CFLAGS_COMMON -gcodeview)
+endif()
+list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON -g)
 
 # Use -D instead of definitions to please custom compile command.
 list(APPEND ASAN_UNITTEST_COMMON_CFLAGS
   -DASAN_HAS_BLACKLIST=1
   -DASAN_HAS_EXCEPTIONS=1
   -DASAN_UAR=0)
 
 if(APPLE)

lib/sanitizer_common/tests/CMakeLists.txt

 endif()
 
 # -gline-tables-only must be enough for these tests, so use it if possible.
 if(COMPILER_RT_TEST_COMPILER_ID MATCHES "Clang")
   list(APPEND SANITIZER_TEST_CFLAGS_COMMON -gline-tables-only)
 else()
   list(APPEND SANITIZER_TEST_CFLAGS_COMMON -g)
 endif()
+if(MSVC)
+  list(APPEND SANITIZER_TEST_CFLAGS_COMMON -gcodeview)
+endif()
+list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON -g)
 
 if(NOT MSVC)
   list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON --driver-mode=g++)
 endif()
 
 if(ANDROID)
   list(APPEND SANITIZER_TEST_LINK_FLAGS_COMMON -pie)
 endif()