Replace every String in Target(Options) with Cow<'static, str>

compiler/rustc_target/src/spec/i686_pc_windows_msvc.rs

@@ -2,17 +2,17 @@ use crate::spec::{LinkerFlavor, LldFlavor, Target};
 
 pub fn target() -> Target {
     let mut base = super::windows_msvc_base::opts();
-    base.cpu = "pentium4".to_string();
+    base.cpu = "pentium4".into();
     base.max_atomic_width = Some(64);
 
     let pre_link_args_msvc = vec![
         // Mark all dynamic libraries and executables as compatible with the larger 4GiB address
         // space available to x86 Windows binaries on x86_64.
-        "/LARGEADDRESSAWARE".to_string(),
+        "/LARGEADDRESSAWARE".into(),
         // Ensure the linker will only produce an image if it can also produce a table of
         // the image's safe exception handlers.
         // https://docs.microsoft.com/en-us/cpp/build/reference/safeseh-image-has-safe-exception-handlers
-        "/SAFESEH".to_string(),
+        "/SAFESEH".into(),
     ];
     base.pre_link_args.entry(LinkerFlavor::Msvc).or_default().extend(pre_link_args_msvc.clone());
     base.pre_link_args
@@ -23,12 +23,12 @@ pub fn target() -> Target {
     base.has_thread_local = false;
 
     Target {
-        llvm_target: "i686-pc-windows-msvc".to_string(),
+        llvm_target: "i686-pc-windows-msvc".into(),
         pointer_width: 32,
         data_layout: "e-m:x-p:32:32-p270:32:32-p271:32:32-p272:64:64-\
             i64:64-f80:128-n8:16:32-a:0:32-S32"
-            .to_string(),
-        arch: "x86".to_string(),
+            .into(),
+        arch: "x86".into(),
         options: base,
     }
 }