Hi ,
   
  in toolchain.gypi,  when OS == "android", v8 is compiled with -O2. 
['OS=="android"', {
    'cflags!': [
        '-O3',
        '-Os',
    ],
    'cflags': [
        '-fdata-sections',
        '-ffunction-sections',
        '-O2',
    ],
}],

and i knew  why not use -O3 flags.
see https://chromiumcodereview.appspot.com/15929009

so my question is why not use -Os?

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