gh-125498: Update JIT builds to use LLVM 19 and use `preserve_none` #129426

Job	Run time
Change detection / Compute changed files	11s
Check if generated files are up to date	3m 25s
Address sanitizer	7m 56s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.0.15)	2m 32s
Windows MSI${{ '' }}	0s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.1.7)	2m 8s
CIFuzz (address)	20m 32s
CIFuzz (undefined)	22m 49s
Hypothesis tests on Ubuntu	5m 15s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.2.3)	2m 25s
CIFuzz (memory)	20m 55s
Ubuntu SSL tests with OpenSSL (ubuntu-22.04, 3.3.2)	2m 20s
Thread sanitizer / Thread sanitizer	4m 8s
Thread sanitizer (free-threading) / Thread sanitizer	7m 20s
WASI / build and test	6m 11s
Windows / build (arm64)	2m 50s
Windows (free-threading) / build (arm64)	3m 31s
Windows / build and test (Win32)	16m 12s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	12m 22s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 25s
macOS / build and test (macos-13)	12m 38s
Windows (free-threading) / build and test (Win32)	23m 56s
Windows / build and test (x64)	15m 47s
Windows (free-threading) / build and test (x64)	22m 19s
Ubuntu / build and test (ubuntu-22.04)	7m 25s
Ubuntu (free-threading) / build and test (ubuntu-22.04)	9m 55s
Docs / Docs	2m 0s
Docs / Docs (Oldest Sphinx)	1m 46s
Docs / Doctest	17m 37s
All required checks pass	3s
	4h 21m 53s

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