[ruby-core:97789] [Ruby master Feature#16773] Reduce allocations in net/http

Issue #16773 has been reported by timcraft (Tim Craft).

----------------------------------------
Feature #16773: Reduce allocations in net/http
https://bugs.ruby-lang.org/issues/16773

* Author: timcraft (Tim Craft)
* Status: Open
* Priority: Normal
----------------------------------------
Some minor patches which help to reduce allocations in net/http, which should benefit any programs making heavy use of net/http:

* patch1.diff sets frozen_string_literal to true for some net/http files (I used `''.dup` for mutable strings to match existing code)

* patch2.diff uses (frozen) strings instead of regexps for split separator arguments in `lib/net/http/header.rb`

* patch3.diff eliminates some calls to `self[]` in `lib/net/http/header.rb` which eliminates some unnecessary downcasing and string allocations

With these patches applied I get a modest but significant reduction in allocations using a test script which performs 10 HTTP requests representative of the workload for my use case (using net/http inside a web application). Before (recent master):
```
Total allocated: 3.21 MB (34031 objects)
```

After (with patches applied):
```
Total allocated: 2.99 MB (28756 objects)
```

I have run `make test-all TESTS=net/http` and all tests still pass.


---Files--------------------------------
patch1.diff (1.75 KB)
patch2.diff (742 Bytes)
patch3.diff (1.07 KB)


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