40ef5c4f14
Calling `Emoji.tonable_emojis` fetches from the cache but creates
a giant array each time it is called.
```
MemoryProfiler.report { Emoji.unicode_replacements }.pretty_print
```
Before:
```
Total allocated: 16560770 bytes (246364 objects)
Total retained: 784793 bytes (10624 objects)
allocated memory by gem
-----------------------------------
10224581 activesupport-4.2.8
3504241 hiredis-0.6.1
1449466 discourse/app
679314 2.4.1/lib
419592 discourse/lib
226720 redis-3.3.3
56680 activerecord-4.2.8
176 thread_safe-0.3.6
```
After:
```
Total allocated: 2127703 bytes (30556 objects)
Total retained: 798099 bytes (10735 objects)
allocated memory by gem
-----------------------------------
1270762 discourse/app
690149 2.4.1/lib
106977 bootsnap-1.0.0
48764 activesupport-4.2.8
5266 logster-1.2.7
2473 hiredis-0.6.1
2056 redis-3.3.3
840 discourse/lib
240 activerecord-4.2.8
176 thread_safe-0.3.6
```
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