Replace lazy_static with better equivalent

Summary:
Preference order:

- `const`
- `std::sync::OnceLock`
- `std::sync::LazyLock` if already is using unstable features or if it's
  a package that has no hope of ever building with cargo.
- `once_cell::sync::Lazy` as a last resort (since this is easy to
  codemod to `std::sync::LazyLock` when that's stable).

Reviewed By: dtolnay

Differential Revision: D49988865

fbshipit-source-id: 51b916aaba4bae32e3f415bbf8c7ceedb36c5e11

common/rust/shed/hostcaps/Cargo.toml

@@ -14,7 +14,7 @@ name = "test_hostcaps"
 path = "src/bin/test.rs"
 
 [dependencies]
-lazy_static = "1.4"
+once_cell = "1.12"
 
 [features]
 default = []

common/rust/shed/hostcaps/src/lib.rs

@@ -7,7 +7,8 @@
  * of this source tree.
  */
 
-use lazy_static::lazy_static;
+use once_cell::sync::Lazy;
+
 #[cfg(any(fbcode_build, feature = "fb"))]
 mod facebook;
 #[cfg(any(fbcode_build, feature = "fb"))]
@@ -21,11 +22,9 @@ pub use facebook::is_prod;
 #[cfg(any(fbcode_build, feature = "fb"))]
 pub use facebook::Env;
 
-lazy_static! {
-    pub static ref IN_PROD: bool = is_prod();
-    pub static ref IN_CORP: bool = is_corp();
-    pub static ref IN_LAB: bool = is_lab();
-}
+pub static IN_PROD: Lazy<bool> = Lazy::new(is_prod);
+pub static IN_CORP: Lazy<bool> = Lazy::new(is_corp);
+pub static IN_LAB: Lazy<bool> = Lazy::new(is_lab);
 
 #[cfg(not(any(fbcode_build, feature = "fb")))]
 pub fn get_env() -> u8 {