Remove dead code found by ILLink. (dotnet/coreclr#16759)

I'm preparing changes to enable running ILLink on SPC
(similarly to what we do on corefx assemblies).
There will be a separate PR for those changes.

This PR just removes the dead code flagged by ILLink from the sources.

Signed-off-by: dotnet-bot <dotnet-bot@microsoft.com>

5 files changed, 0 insertions, 41 deletions

diff --git a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs
index 9ac32c3bd..d9f9f081c 100644
--- a/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs
+++ b/src/System.Private.CoreLib/shared/System/Diagnostics/Tracing/ActivityTracker.cs
@@ -248,11 +248,6 @@ namespace System.Diagnostics.Tracing
         #region private
 
         /// <summary>
-        /// The current activity ID.  Use this to log normal events.  
-        /// </summary>
-        private Guid CurrentActivityId { get { return m_current.Value.ActivityId; } }
-
-        /// <summary>
         /// Searched for a active (nonstopped) activity with the given name.  Returns null if not found.  
         /// </summary>
         private ActivityInfo FindActiveActivity(string name, ActivityInfo startLocation)
diff --git a/src/System.Private.CoreLib/shared/System/Globalization/DaylightTime.cs b/src/System.Private.CoreLib/shared/System/Globalization/DaylightTime.cs
index e6920b366..72a572c97 100644
--- a/src/System.Private.CoreLib/shared/System/Globalization/DaylightTime.cs
+++ b/src/System.Private.CoreLib/shared/System/Globalization/DaylightTime.cs
@@ -11,10 +11,6 @@ namespace System.Globalization
         private readonly DateTime _end;
         private readonly TimeSpan _delta;
 
-        private DaylightTime()
-        {
-        }
-
         public DaylightTime(DateTime start, DateTime end, TimeSpan delta)
         {
             _start = start;
diff --git a/src/System.Private.CoreLib/shared/System/IO/Path.cs b/src/System.Private.CoreLib/shared/System/IO/Path.cs
index fe6234cc7..9033350a8 100644
--- a/src/System.Private.CoreLib/shared/System/IO/Path.cs
+++ b/src/System.Private.CoreLib/shared/System/IO/Path.cs
@@ -477,22 +477,6 @@ namespace System.IO
             return true;
         }
 
-        private static string CombineInternal(ReadOnlySpan<char> first, ReadOnlySpan<char> second)
-        {
-            if (first.Length == 0)
-                return second.Length == 0
-                    ? string.Empty
-                    : new string(second);
-
-            if (second.Length == 0)
-                return new string(first);
-
-            if (IsPathRooted(second))
-                return new string(second);
-
-            return JoinInternal(first, second);
-        }
-
         private static string CombineInternal(string first, string second)
         {
             if (string.IsNullOrEmpty(first))
diff --git a/src/System.Private.CoreLib/shared/System/IO/PathInternal.Windows.cs b/src/System.Private.CoreLib/shared/System/IO/PathInternal.Windows.cs
index 81d51ba4b..5b1a133ca 100644
--- a/src/System.Private.CoreLib/shared/System/IO/PathInternal.Windows.cs
+++ b/src/System.Private.CoreLib/shared/System/IO/PathInternal.Windows.cs
@@ -270,19 +270,6 @@ namespace System.IO
             return i;
         }
 
-        private static bool StartsWithOrdinal(ReadOnlySpan<char> source, string value)
-        {
-            if (source.Length < value.Length)
-                return false;
-
-            for (int i = 0; i < value.Length; i++)
-            {
-                if (value[i] != source[i])
-                    return false;
-            }
-            return true;
-        }
-
         /// <summary>
         /// Returns true if the path specified is relative to the current drive or working directory.
         /// Returns false if the path is fixed to a specific drive or UNC path.  This method does no
diff --git a/src/System.Private.CoreLib/shared/System/Number.Parsing.cs b/src/System.Private.CoreLib/shared/System/Number.Parsing.cs
index c6ae34d05..70fc9aea8 100644
--- a/src/System.Private.CoreLib/shared/System/Number.Parsing.cs
+++ b/src/System.Private.CoreLib/shared/System/Number.Parsing.cs
@@ -956,9 +956,6 @@ namespace System
 
             public static unsafe ulong Mantissa(double d) =>
                 *((ulong*)&d) & 0x000fffffffffffff;
-
-            public static unsafe bool Sign(double d) =>
-                (*((uint*)&d + 1) >> 31) != 0;
         }
     }
 }