6879689: Fix warning about ignored return value when compiling with -O2 Summary: Store the return value of fwrite and check it matches the size of the array. Reviewed-by: twisti, dholmes

6858208: jvm crash when specifying TypeProfileWidth=0 on jdk 6.0 Summary: Add an explicit check for TypeProfileWidth == 0 in record_klass_in_profile_helper() functions. Reviewed-by: never, coleenp