Remove lint annotations in specific crates that are already enforced by rustbuild

Remove some random unnecessary lint `allow`s

src/librustc_codegen_llvm/error_codes.rs

@@ -1,5 +1,3 @@
-#![allow(non_snake_case)]
-
 register_long_diagnostics! {
 
 E0511: r##"

src/librustc_codegen_llvm/intrinsic.rs

@@ -1,5 +1,3 @@
-#![allow(non_upper_case_globals)]
-
 use crate::attributes;
 use crate::llvm;
 use crate::llvm_util;

src/librustc_codegen_llvm/lib.rs

@@ -12,7 +12,6 @@
 #![feature(crate_visibility_modifier)]
 #![feature(extern_types)]
 #![feature(in_band_lifetimes)]
-#![allow(unused_attributes)]
 #![feature(libc)]
 #![feature(nll)]
 #![feature(rustc_diagnostic_macros)]
@@ -22,7 +21,6 @@
 #![feature(static_nobundle)]
 #![feature(trusted_len)]
 #![feature(mem_take)]
-#![deny(rust_2018_idioms)]
 #![deny(unused_lifetimes)]
 
 use back::write::{create_target_machine, create_informational_target_machine};

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -1,3 +1,6 @@
+#![allow(non_camel_case_types)]
+#![allow(non_upper_case_globals)]
+
 use super::debuginfo::{
     DIBuilder, DIDescriptor, DIFile, DILexicalBlock, DISubprogram, DIType,
     DIBasicType, DIDerivedType, DICompositeType, DIScope, DIVariable,

src/librustc_codegen_llvm/llvm/mod.rs

@@ -1,7 +1,4 @@
-#![allow(non_upper_case_globals)]
-#![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
-#![deny(bare_trait_objects)]
 
 pub use self::IntPredicate::*;
 pub use self::RealPredicate::*;

src/librustc_codegen_llvm/type_.rs

@@ -1,5 +1,3 @@
-#![allow(non_upper_case_globals)]
-
 pub use crate::llvm::Type;
 
 use crate::llvm;