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This commit adds the following functions all of which have a signature `pointer, usize -> pointer`: - `<*mut T>::mask` - `<*const T>::mask` - `intrinsics::ptr_mask` These functions are equivalent to `.map_addr(|a| a & mask)` but they utilize `llvm.ptrmask` llvm intrinsic. *masks your pointers*
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.