JIT

gh-131798: Use `sym_new_type` instead of `sym_new_not_null` for _BUILD_STRING, _BUILD_SET #3305

Job	Run time
Interpreter (Debug)	9m 16s
Free-Threaded (Debug) (19)	13m 36s
i686-pc-windows-msvc/msvc (Debug)	3m 24s
i686-pc-windows-msvc/msvc (Release)	4m 24s
x86_64-pc-windows-msvc/msvc (Debug)	3m 56s
x86_64-pc-windows-msvc/msvc (Release)	4m 7s
aarch64-pc-windows-msvc/msvc (Debug)	23s
aarch64-pc-windows-msvc/msvc (Release)	5m 36s
x86_64-apple-darwin/clang (Debug)	11m 52s
x86_64-apple-darwin/clang (Release)	10m 58s
aarch64-apple-darwin/clang (Debug)	9m 3s
aarch64-apple-darwin/clang (Release)	8m 14s
x86_64-unknown-linux-gnu/gcc (Debug)	9m 52s
x86_64-unknown-linux-gnu/gcc (Release)	6m 9s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 52s
aarch64-unknown-linux-gnu/gcc (Release)	6m 5s
	1h 54m 47s

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