Fix clippy::needless-lifetimes in bootstrap

src/bootstrap/src/core/build_steps/tool.rs

@@ -1096,7 +1096,7 @@ tool_extended!((self, builder),
     Rustfmt, "src/tools/rustfmt", "rustfmt", stable=true, add_bins_to_sysroot = ["rustfmt", "cargo-fmt"];
 );
 
-impl<'a> Builder<'a> {
+impl Builder<'_> {
     /// Gets a `BootstrapCommand` which is ready to run `tool` in `stage` built for
     /// `host`.
     pub fn tool_cmd(&self, tool: Tool) -> BootstrapCommand {

src/bootstrap/src/core/builder.rs

@@ -63,7 +63,7 @@ pub struct Builder<'a> {
     pub paths: Vec<PathBuf>,
 }
 
-impl<'a> Deref for Builder<'a> {
+impl Deref for Builder<'_> {
     type Target = Build;
 
     fn deref(&self) -> &Self::Target {

src/bootstrap/src/core/config/config.rs

@@ -996,7 +996,7 @@ impl<'de> Deserialize<'de> for RustOptimize {
 
 struct OptimizeVisitor;
 
-impl<'de> serde::de::Visitor<'de> for OptimizeVisitor {
+impl serde::de::Visitor<'_> for OptimizeVisitor {
     type Value = RustOptimize;
 
     fn expecting(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
@@ -1071,7 +1071,7 @@ impl<'de> Deserialize<'de> for LldMode {
     {
         struct LldModeVisitor;
 
-        impl<'de> serde::de::Visitor<'de> for LldModeVisitor {
+        impl serde::de::Visitor<'_> for LldModeVisitor {
             type Value = LldMode;
 
             fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {

src/bootstrap/src/utils/cache.rs

@@ -39,17 +39,17 @@ impl PartialEq<str> for Interned<String> {
         *self == other
     }
 }
-impl<'a> PartialEq<&'a str> for Interned<String> {
+impl PartialEq<&str> for Interned<String> {
     fn eq(&self, other: &&str) -> bool {
         **self == **other
     }
 }
-impl<'a, T> PartialEq<&'a Interned<T>> for Interned<T> {
+impl<T> PartialEq<&Interned<T>> for Interned<T> {
     fn eq(&self, other: &&Self) -> bool {
         self.0 == other.0
     }
 }
-impl<'a, T> PartialEq<Interned<T>> for &'a Interned<T> {
+impl<T> PartialEq<Interned<T>> for &Interned<T> {
     fn eq(&self, other: &Interned<T>) -> bool {
         self.0 == other.0
     }