[shared] Mark Platforms constants and Stopwatch frequence as shared.

BUG=#61030
TEST=ci

CoreLibraryReviewExempt: this cl adds vm-specific pragma decoration
Change-Id: Ia238c901d7b94f2ff7e5ad578f829e25cd1ba804
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/445560
Reviewed-by: Slava Egorov <[email protected]>
Commit-Queue: Alexander Aprelev <[email protected]>

Author: aam

pkg/vm/testcases/transformations/vm_constant_evaluator/errors/not_constant_field.dart.linux.expect

@@ -1,5 +1,5 @@
 Constant evaluation error: Constant evaluation error:
-platform_impl.dart:2772 Constant evaluation error: The invocation of '_environmentCache' is not allowed in a constant expression.
+platform_impl.dart:2841 Constant evaluation error: The invocation of '_environmentCache' is not allowed in a constant expression.
 Member: notConstant
 File: not_constant_field.dart
 Offset: 350

sdk/lib/core/stopwatch.dart

@@ -49,6 +49,7 @@ class Stopwatch {
   /// Cached frequency of the system in Hz (ticks per second).
   ///
   /// Value must be returned by [_initTicker], which is called only once.
+  @pragma("vm:shared")
   static final int _frequency = _initTicker();
 
   // The _start and _stop fields capture the time when [start] and [stop]

sdk/lib/io/platform.dart

@@ -80,6 +80,7 @@ abstract final class Platform {
   /// Note that this list may change over time so platform-specific logic
   /// should be guarded by the appropriate Boolean getter e.g. [isMacOS].
   @pragma("vm:platform-const")
+  @pragma("vm:shared")
   static final operatingSystem = _Platform.operatingSystem;
 
   /// A string representing the version of the operating system or platform.
@@ -89,6 +90,7 @@ abstract final class Platform {
   ///   "Linux 5.11.0-1018-gcp #20~20.04.2-Ubuntu SMP Fri Sep 3 01:01:37 UTC 2021"
   ///   "Version 14.5 (Build 18E182)"
   ///   '"Windows 10 Pro" 10.0 (Build 19043)'
+  @pragma("vm:shared")
   static final operatingSystemVersion = _Platform.operatingSystemVersion;
 
   /// The local hostname for the system.
@@ -100,6 +102,7 @@ abstract final class Platform {
   /// Uses the platform
   /// [`gethostname`](https://pubs.opengroup.org/onlinepubs/9699919799/functions/gethostname.html)
   /// implementation.
+  @pragma("vm:shared")
   static final localHostname = _Platform.localHostname;
 
   /// The version of the current Dart runtime.
@@ -108,6 +111,7 @@ abstract final class Platform {
   /// string representing the version of the current Dart runtime,
   /// possibly followed by whitespace and other version and
   /// build details.
+  @pragma("vm:shared")
   static final version = _Platform.version;
 
   /// Get the name of the current locale.
@@ -138,11 +142,13 @@ abstract final class Platform {
   /// version of Linux that identifies itself by a different name,
   /// for example Android (see [isAndroid]).
   @pragma("vm:platform-const")
+  @pragma("vm:shared")
   static final bool isLinux = (operatingSystem == "linux");
 
   /// Whether the operating system is a version of
   /// [macOS](https://en.wikipedia.org/wiki/MacOS).
   @pragma("vm:platform-const")
+  @pragma("vm:shared")
   static final bool isMacOS = (operatingSystem == "macos");
 
   /// Whether the operating system is a version of
@@ -154,16 +160,19 @@ abstract final class Platform {
   /// Whether the operating system is a version of
   /// [Android](https://en.wikipedia.org/wiki/Android_%28operating_system%29).
   @pragma("vm:platform-const")
+  @pragma("vm:shared")
   static final bool isAndroid = (operatingSystem == "android");
 
   /// Whether the operating system is a version of
   /// [iOS](https://en.wikipedia.org/wiki/IOS).
   @pragma("vm:platform-const")
+  @pragma("vm:shared")
   static final bool isIOS = (operatingSystem == "ios");
 
   /// Whether the operating system is a version of
   /// [Fuchsia](https://en.wikipedia.org/wiki/Google_Fuchsia).
   @pragma("vm:platform-const")
+  @pragma("vm:shared")
   static final bool isFuchsia = (operatingSystem == "fuchsia");
 
   /// The environment for this process as a map from string key to string value.

sdk/lib/io/platform_impl.dart

@@ -33,8 +33,11 @@ class _Platform {
   external static String _localeName();
   external static Uri _script();
 
+  @pragma("vm:shared")
   static String executable = _executable();
+  @pragma("vm:shared")
   static String resolvedExecutable = _resolvedExecutable();
+  @pragma("vm:shared")
   static String? packageConfig = _packageConfig();
 
   @pragma("vm:entry-point")