Rollup merge of #41524 - michaelwu:basic-hexagon, r=alexcrichton
Add Hexagon support This requires an updated LLVM with https://reviews.llvm.org/D31999 and https://reviews.llvm.org/D32000 to build libcore. A basic hello world builds and runs successfully on the hexagon simulator. libcore is fine with LLVM fixes, but libstd requires a lot more work since there's a custom rtos running on most hexagon cores. Running Linux sounds possible though, so maybe getting linux + musl going would be easier. Here's the target file I've been using for testing ``` { "arch": "hexagon", "llvm-target": "hexagon-unknown-elf", "os": "none", "target-endian": "little", "target-pointer-width": "32", "data-layout": "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048", "linker": "hexagon-clang", "linker-flavor": "gcc", "executables": true, "cpu": "hexagonv60" } ```
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