I suspect that this is an oversight, but I can confirm that if you edit the line in arduino/hardware/arduino/x86/boards.txt, you can change it to something closer to 200MB:
izmir_fd.upload.maximum_size=200000000
I tested with this script:
int array[1000000];
void setup() {
for (int i=0; i<1000000; ++i)
array[i] = rand();
Serial.begin(115200);
}
void loop() {
for (int i=0; i<1000000; ++i)
Serial.println(array[i]);
}