Is feature compiler_builtins_lib still needed for libstd?

[dingelish]

rust/src/libstd/lib.rs

Line 247 in 374ad1b

#![feature(compiler_builtins_lib)]

After compiler-builtins issue 322 and PR 324, do we still need this line? Compilation succeeded after this line is moved on linux-x86_64.

[dingelish]

Issue 322
rust-lang/compiler-builtins#322

PR324
rust-lang/compiler-builtins#324

[dingelish]

Hi there, could I create an PR to run the CI so that we could check if we can remove this line? Thanks!