Add more measurements to the CGU debug printing.
For example, we go from this:
```
FINAL (4059 items, total_size=232342; 16 CGUs, max_size=39608,
min_size=5468, max_size/min_size=7.2):
- CGU[0] regex.f2ff11e98f8b05c7-cgu.0 (318 items, size=39608):
- fn ...
- fn ...
```
to this:
```
FINAL
- unique items: 2726 (1459 root + 1267 inlined), unique size: 201214 (146046 root + 55168 inlined)
- placed items: 4059 (1459 root + 2600 inlined), placed size: 232342 (146046 root + 86296 inlined)
- placed/unique items ratio: 1.49, placed/unique size ratio: 1.15
- CGUs: 16, mean size: 14521.4, sizes: [39608, 31122, 20318, 20236, 16268, 13777, 12310, 10531, 10205, 9810, 9250, 9065 (x2), 7785, 7524, 5468]
- CGU[0]
- regex.f2ff11e98f8b05c7-cgu.0, size: 39608
- items: 318, mean size: 124.6, sizes: [28395, 3418, 558, 485, 259, 228, 176, 166, 146, 118, 117 (x3), 114 (x5), 113 (x3), 101, 84, 82, 77, 76, 72, 71 (x2), 66, 65, 62, 61, 59 (x2), 57, 55, 54 (x2), 53 (x4), 52 (x5), 51 (x4), 50, 48, 47, 46, 45 (x3), 44, 43 (x5), 42, 40, 38 (x4), 37, 35, 34 (x2), 32 (x2), 31, 30, 28 (x2), 27 (x2), 26 (x3), 24 (x2), 23 (x3), 22 (x2), 21, 20, 16 (x4), 15, 13 (x7), 12 (x3), 11 (x6), 10, 9 (x2), 8 (x4), 7 (x8), 6 (x38), 5 (x21), 4 (x7), 3 (x45), 2 (x63), 1 (x13)]
- fn ...
- fn ...
```
This is a lot more information, distinguishing between root items and
inlined items, showing how much duplication there is of inlined items,
plus the full range of sizes for CGUs and items within CGUs. All of
which is really helpful when analyzing this stuff and trying different
CGU formation algorithms.
95d85899ce