Avoid allocating in TimeZoneInfo.GetHashCode() (dotnet/coreclr#8513)

Avoid the intermediate ToUpper string allocation.

Commit migrated from https://github.com/dotnet/coreclr/commit/bf4ed11eb5cee7123fd0c6fa5b60f09fe7adf23e

diff --git a/src/coreclr/src/mscorlib/src/System/TimeZoneInfo.cs b/src/coreclr/src/mscorlib/src/System/TimeZoneInfo.cs
index 5000206..d8662d4 100644 (file)
--- a/src/coreclr/src/mscorlib/src/System/TimeZoneInfo.cs
+++ b/src/coreclr/src/mscorlib/src/System/TimeZoneInfo.cs
@@ -969,7 +969,7 @@ namespace System {
         // GetHashCode -
         //
         public override int GetHashCode() {
-            return m_id.ToUpper(CultureInfo.InvariantCulture).GetHashCode();
+            return StringComparer.OrdinalIgnoreCase.GetHashCode(m_id);
         }
 
         //