Build fails in release with: ld: Undefined symbols: static (extension in SystemPackage):SystemPackage._StrSlice.== infix(A, A) -> Swift.Bool

Any package which depends on `swift-system` and uses the `==` on `FilePath.Component` will fail to build _in release mode_ (debug is fine).

Consider this example program

```swift
import SystemPackage

print(FilePath("/x").lastComponent! == FilePath("/x").lastComponent!)
```

with the following dependencies/targets

```
dependencies: [
.package(url: "https://github.com/apple/swift-system.git", from: "1.0.0"),
],
targets: [
.executableTarget(
name: "repro",
dependencies: [
.product(name: "SystemPackage", package: "swift-system"),
]
),
]
```

debug works

```
$ swift run
Building for debugging...
Build complete! (0.34s)
true
```

release fails

```
$ swift run -c release
Building for production...
error: link command failed with exit code 1 (use -v to see invocation)
ld: Undefined symbols:
static (extension in SystemPackage):SystemPackage._StrSlice.== infix(A, A) -> Swift.Bool, referenced from:
_repro_main in main.swift.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: fatalError
[0/1] Linking repro
```

Also reproes in Xcode.

This is Xcode 15A221 but also reproduces on anything else I tried.

Start with the minimal Swift program using SystemPackage and FilePath.Component equality, then reproduce the failure with `swift run -c release` and compare it with the successful debug build. Trace the release link failure for `SystemPackage._StrSlice.==` and verify that the example builds and runs successfully in release mode, including in Xcode if applicable.

Written by the indexing model from the issue text.