Rollup merge of #63296 - alexcrichton:deduplicate-demangle, r=Mark-Simulacrum

Deduplicate rustc_demangle in librustc_codegen_llvm

This commit removes the crates.io dependency of `rustc-demangle` from
`rustc_codegen_llvm`. This crate is actually already pulled in to part
of the `librustc_driver` build and with the upcoming pipelining
implementation in Cargo it causes build issues if `rustc-demangle` is
left to its own devices.

This is not currently required, but once pipelining is enabled for
rustc's own build it will be required to build correctly.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/librustc_codegen_llvm/lib.rs b/src/librustc_codegen_llvm/lib.rs
index a630817fb33..653dd8868f4 100644
--- a/src/librustc_codegen_llvm/lib.rs
+++ b/src/librustc_codegen_llvm/lib.rs
@@ -25,6 +25,7 @@
 use back::write::{create_target_machine, create_informational_target_machine};
 use syntax_pos::symbol::Symbol;
 
+extern crate rustc_demangle;
 extern crate flate2;
 #[macro_use] extern crate bitflags;
 extern crate libc;