[ruby-core:112957] [Ruby master Bug#19284] Integer overflow when using RUBY_GC_HEAP_INIT_SLOTS environment variable

Issue #19284 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.7: DONTNEED, 3.0: DONTNEED, 3.1: REQUIRED, 3.2: DONE to 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONE, 3.2: DONE

ruby_3_1 782a9c2ddfcc84c3bd3a1fa153f7ac1f3e92a2e1 merged revision(s) 90a80eb076429978e720e11fb17a3cbb96de3454.

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Bug #19284: Integer overflow when using RUBY_GC_HEAP_INIT_SLOTS environment variable
https://bugs.ruby-lang.org/issues/19284#change-102484

* Author: zeke (Zeke Gabrielse)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-darwin19]
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONE, 3.2: DONE
----------------------------------------
If you set the environment variable `RUBY_GC_HEAP_INIT_SLOTS` to anything other than `0`, an integer overflow runtime error occurs:

```ruby
RUBY_GC_HEAP_INIT_SLOTS=10000 ruby -e 'puts "hello, world!"'
# => ruby: integer overflow: 3689348814741910508 * 8 > 18446744073709551615 (RuntimeError)
```

At this time, I'm not sure if this is platform-specific, but it's failing on Darwin as well as Heroku's environment (Linux).



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