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Rollup of 5 pull requests - #60646
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... on different platforms. Official rustdoc of [`usize::to_le_bytes`](https://doc.rust-lang.org/std/primitive.usize.html#method.to_le_bytes) displays signature ``` pub fn to_ne_bytes(self) -> [u8; 8] ``` which might be misleading: this function returns 4 bytes on 32-bit systems.
It was fixed somewhere between 1.28.0 and 1.31.1 closesrust-lang#50518
Pulls in a fix for ensuring that wasm targets have code in compiler-builtins for `ldexp` which LLVM can generate references to.
to_xe_bytes for isize and usize returns an array of different size ... on different platforms. Official rustdoc of [`usize::to_le_bytes`](https://doc.rust-lang.org/std/primitive.usize.html#method.to_le_bytes) displays signature ``` pub fn to_ne_bytes(self) -> [u8; 8] ``` which might be misleading: this function returns 4 bytes on 32-bit systems. With this commit applied rustdoc for `isize` and `usize` is this: <img width="740" alt="2019-04-15_0020" src="https://user-images.githubusercontent.com/28969/56100765-9f69b380-5f14-11e9-974c-daa25edaa881.png">
std: Update compiler-builtins crate Pulls in a fix for ensuring that wasm targets have code in compiler-builtins for `ldexp` which LLVM can generate references to.
…-obk Add test for rust-lang#59972 This PR adds a test for rust-lang#59972, which was fixed in rust-lang#59897. Closesrust-lang#59972. r? @eddyb
test for rust-lang#50518 It was fixed somewhere between 1.28.0 and 1.31.1 closesrust-lang#50518 r? @estebank Where's the best place to add this test? I *think* we want "compile-pass" for this test (no need to run a binary, and not running saves us a millisecond of process creation) , but there's no compile-pass anymore. Should this be UI test with empty stdout, stderr and zero return code?
Document + Cleanup lang_items.rs Byproduct of work on rust-lang#60607. r? @oli-obk
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r? @ghost