macOS: Remove ASan debug flags from release config.

Setting `PLATFORM_LINKLIBS` is not required for clang, compiler and
linker flags are enough. Note that the change made in
{rBa4c5811e2127}) to `platform_apple.cmake` (appending to
`PLATFORM_CFLAGS`) has not been reverted. platform file shouldn't be
overwriting the flags.

`PLATFORM_LINKFLAGS` is overwritten by `platform_apple.cmake`, so no
point in setting it. Fixing that like `PLATFORM_CFLAGS` is out of the
scope of this change.

`PLATFORM_LINKFLAGS_DEBUG` has been replaced with generator expression
to include RelWithDebInfo and MinSizeRel build types also.

CMakeLists.txt

@@ -859,13 +859,13 @@ if(NOT CMAKE_BUILD_TYPE MATCHES "Release")
     if(MSVC)
       set(COMPILER_ASAN_LINKER_FLAGS "/FUNCTIONPADMIN:6")
     endif()
-    if(APPLE)
-      # COMPILER_ASAN_CFLAGS and COMPILER_ASAN_CXXFLAGS are the same as of
-      # now, so use either for PLATFORM_CFLAGS.
-      set(PLATFORM_CFLAGS "${PLATFORM_CFLAGS} ${COMPILER_ASAN_CFLAGS}")
-      set(COMPILER_ASAN_LINKER_FLAGS "-fno-omit-frame-pointer -fsanitize=address")
-    endif(APPLE)
-    if(COMPILER_ASAN_LIBRARY)
+
+    if(APPLE AND COMPILER_ASAN_LIBRARY)
+      string(REPLACE " " ";" _list_COMPILER_ASAN_CFLAGS ${COMPILER_ASAN_CFLAGS})
+      add_compile_options("$<$<NOT:$<CONFIG:Release>>:${_list_COMPILER_ASAN_CFLAGS}>")
+      add_link_options("$<$<NOT:$<CONFIG:Release>>:-fno-omit-frame-pointer;-fsanitize=address>")
+      unset(_list_COMPILER_ASAN_CFLAGS)
+    elseif(COMPILER_ASAN_LIBRARY)
       set(PLATFORM_LINKLIBS "${PLATFORM_LINKLIBS};${COMPILER_ASAN_LIBRARY}")
       set(PLATFORM_LINKFLAGS "${COMPILER_ASAN_LIBRARY} ${COMPILER_ASAN_LINKER_FLAGS}")
       set(PLATFORM_LINKFLAGS_DEBUG "${COMPILER_ASAN_LIBRARY} ${COMPILER_ASAN_LINKER_FLAGS}")