gdb: add 'scylla memory' command
gdb: add 'scylla memory' command

Useful for analyzing memory leaks:

(gdb) scylla memory
objsz spansz    usedobj       memory  wst%
    1   4096          0            0   0.0
    1   4096          0            0   0.0
    1   4096          0            0   0.0
    1   4096          0            0   0.0
    2   4096          0            0   0.0
    2   4096          0            0   0.0
    3   4096          0            0   0.0
    3   4096          0            0   0.0
    4   4096          0            0   0.0
    5   4096          0            0   0.0
    6   4096          0            0   0.0
    7   4096          0            0   0.0
    8   4096        422         8192  58.8
   10   4096          0            0   0.0
   12   4096          0            0   0.0
   14   4096          0         8192  99.8
   16   4096        409         8192  20.1
   20   4096          0            0   0.0
   24   4096          0            0   0.0
   28   4096        653        24576  25.4
   32   4096       1069        36864   7.2
   40   4096          0            0   0.0
   48   4096          0            0   0.0
   56   4096       1228        73728   6.5
   64   4096        616        40960   3.8
   80   4096          0            0   0.0
   96   4096          0            0   0.0
  112   4096        919       110592   5.4
  128   4096        141        24576  26.6
  160   8192          0            0   0.0
  192   8192          0            0   0.0
  224   8192        128        49152  40.1
  256   8192         72        40960  55.0
  320  16384          0            0   0.0
  384  16384          0            0   0.0
  448  16384         60        49152  43.8
  512  16384         29        49152  69.8
  640  32768          0            0   0.0
  768  32768          0            0   0.0
  896  32768         47        98304  55.6
 1024  32768          5        98304  94.8
 1280  65536          0            0   0.0
 1536  65536          0            0   0.0
 1792  65536         31       196608  70.2
 2048  65536          8       196608  91.7
 2560 131072          0            0   0.0
 3072 131072          0            0   0.0
 3584 131072         34       393216  67.4
 4096 131072          0       393216 100.0
 5120 262144          0            0   0.0
 6144 262144          0            0   0.0
 7168 262144         33       786432  68.4
 8192 262144          4       786432  95.8
10240 524288          0            0   0.0
12288 524288          0            0   0.0
14336 524288         33      1572864  68.4
16384 524288          0      1572864 100.0

avikivity/scylla,shaunstanislaus/scylla,eklitzke/scylla,glommer/scylla,acbellini/scylla,justintung/scylla,tempbottle/scylla,wildinto/scylla,scylladb/scylla,duarten/scylla,victorbriz/scylla,guiquanz/scylla,bowlofstew/scylla,aruanruan/scylla,kangkot/scylla,kjniemi/scylla,linearregression/scylla,guiquanz/scylla,phonkee/scylla,aruanruan/scylla,rentongzhang/scylla,acbellini/scylla,stamhe/scylla,asias/scylla,gwicke/scylla,dwdm/scylla,eklitzke/scylla,kjniemi/scylla,rentongzhang/scylla,aruanruan/scylla,phonkee/scylla,gwicke/scylla,wildinto/scylla,bowlofstew/scylla,stamhe/scylla,scylladb/scylla,justintung/scylla,senseb/scylla,kangkot/scylla,capturePointer/scylla,duarten/scylla,bowlofstew/scylla,glommer/scylla,victorbriz/scylla,tempbottle/scylla,raphaelsc/scylla,linearregression/scylla,avikivity/scylla,gwicke/scylla,asias/scylla,linearregression/scylla,wildinto/scylla,guiquanz/scylla,respu/scylla,asias/scylla,victorbriz/scylla,kangkot/scylla,eklitzke/scylla,rluta/scylla,rentongzhang/scylla,tempbottle/scylla,dwdm/scylla,rluta/scylla,shaunstanislaus/scylla,senseb/scylla,dwdm/scylla,raphaelsc/scylla,capturePointer/scylla,respu/scylla,acbellini/scylla,phonkee/scylla,justintung/scylla,shaunstanislaus/scylla,stamhe/scylla,rluta/scylla,glommer/scylla,duarten/scylla,scylladb/scylla,kjniemi/scylla,avikivity/scylla,respu/scylla,senseb/scylla,scylladb/scylla,capturePointer/scylla,raphaelsc/scylla