[Minor] Respect full debug request in sanitizers config

cmake/Sanitizer.cmake

 set (SAN_FLAGS "${SAN_FLAGS} -g -fno-omit-frame-pointer -DSANITIZER")
 # O1 is normally set by clang, and -Og by gcc
 if (COMPILER_GCC)
-    set (SAN_FLAGS "${SAN_FLAGS} -Og")
+    if (ENABLE_FULL_DEBUG MATCHES "ON")
+        set (SAN_FLAGS "${SAN_FLAGS} -O0")
+    else()
+        set (SAN_FLAGS "${SAN_FLAGS} -Og")
+    endif()
 else ()
-    set (SAN_FLAGS "${SAN_FLAGS} -O1")
+    if (ENABLE_FULL_DEBUG MATCHES "ON")
+        set (SAN_FLAGS "${SAN_FLAGS} -O0")
+    else()
+        set (SAN_FLAGS "${SAN_FLAGS} -O1")
+    endif()
 endif ()
 if (SANITIZE)
     if (ENABLE_JEMALLOC MATCHES "ON")