Importing rustc-1.61.0

Test: ./build.py --lto=thin
Change-Id: I5c65158a0532cb09120797ae48d6b353492c1011
diff --git a/compiler/rustc_target/src/spec/thumb_base.rs b/compiler/rustc_target/src/spec/thumb_base.rs
index e2e5285..ef6038e 100644
--- a/compiler/rustc_target/src/spec/thumb_base.rs
+++ b/compiler/rustc_target/src/spec/thumb_base.rs
@@ -36,7 +36,7 @@
         linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
         executables: true,
         // In most cases, LLD is good enough
-        linker: Some("rust-lld".to_string()),
+        linker: Some("rust-lld".into()),
         // Because these devices have very little resources having an unwinder is too onerous so we
         // default to "abort" because the "unwind" strategy is very rare.
         panic_strategy: PanicStrategy::Abort,