Auto merge of #32236 - alexcrichton:better-compile-intrinsics, r=arielb1
rustc: Improve compile time of platform intrinsics This commit improves the compile time of `rustc_platform_intrinsics` from 23s to 3.6s if compiling with `-O` and from 77s to 17s if compiling with `-O -g`. The compiled rlib size also drops from 3.1M to 1.2M. The wins here were gained by removing the destructors associated with `Type` by removing the internal `Box` and `Vec` indirections. These destructors meant that a lot of landing pads and extra code were generated to manage the runtime representations. Instead everything can basically be statically computed and shoved into rodata, so all we need is a giant string compare to lookup what's what. Closes #28273
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