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The GCC manual and man page state that -O1 includes -finline-small-functions. However, the description of -finline-small-functions states that it is included by -O2 not by -O1.
I believe that the documentation should be corrected to state that -O1 includes -finline-functions-called-once (and _not_ -finline-small-functions).
This issue was mentioned by Rafał Mużyło in bug #39333 (see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39333#c13), but it deserves to be tracked separately.