SERVER-15182 remove tautological checks for "this" == NULL
SERVER-15305 remove undefined bool conversion error
SERVER-15184 supress warning about memset overwriting vtable ptr
SERVER-15183 suppress warning about fabs value truncation
SERVER-15306 (V8-3.25) suppress warning about "this" == NULL comparison
SERVER-15306 (V8) suppress warning about "this" == NULL comparison