Upgrade CI LLVM version to 19.1 #1514

Job	Run time
Rustfmt	9s
Clippy	21s
Test (aarch64-apple-darwin, macos-latest, nightly)	2m 54s
Test (aarch64-unknown-linux-gnu, ubuntu-latest, nightly)	7m 38s
Test (aarch64-pc-windows-msvc, windows-latest, nightly, 1, 1)	2m 3s
Test (arm-unknown-linux-gnueabi, ubuntu-latest, nightly)	7m 24s
Test (arm-unknown-linux-gnueabihf, ubuntu-latest, nightly)	7m 43s
Test (i586-unknown-linux-gnu, ubuntu-latest, nightly)	5m 52s
Test (i686-unknown-linux-gnu, ubuntu-latest, nightly)	5m 57s
Test (powerpc-unknown-linux-gnu, ubuntu-latest, nightly)	6m 52s
Test (powerpc64-unknown-linux-gnu, ubuntu-latest, nightly)	6m 39s
Test (powerpc64le-unknown-linux-gnu, ubuntu-latest, nightly)	7m 25s
Test (thumbv6m-none-eabi, ubuntu-latest, nightly)	5m 5s
Test (thumbv7em-none-eabi, ubuntu-latest, nightly)	5m 7s
Test (thumbv7em-none-eabihf, ubuntu-latest, nightly)	5m 12s
Test (thumbv7m-none-eabi, ubuntu-latest, nightly)	5m 22s
Test (wasm32-unknown-unknown, ubuntu-latest, nightly)	5m 54s
Test (x86_64-unknown-linux-gnu, ubuntu-latest, nightly)	5m 18s
Test (x86_64-apple-darwin, macos-13, nightly)	4m 38s
Test (i686-pc-windows-msvc, windows-latest, nightly, 1)	4m 39s
Test (x86_64-pc-windows-msvc, windows-latest, nightly, 1)	4m 47s
Test (i686-pc-windows-gnu, windows-latest, nightly-i686-gnu)	5m 29s
Test (x86_64-pc-windows-gnu, windows-latest, nightly-x86_64-gnu)	5m 20s
success	1s
	1h 57m 49s

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