Remove get_ManagedThreadId FCall (#91232)

Author: EgorBo

src/coreclr/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs

@@ -60,11 +60,10 @@ public sealed partial class Thread
 
         private Thread() { }
 
-        public extern int ManagedThreadId
+        public int ManagedThreadId
         {
             [Intrinsic]
-            [MethodImpl(MethodImplOptions.InternalCall)]
-            get;
+            get => _managedThreadId;
         }
 
         /// <summary>Returns handle for interop with EE. The handle is guaranteed to be non-null.</summary>

src/coreclr/vm/comsynchronizable.cpp

@@ -475,17 +475,6 @@ FCIMPL1(void, ThreadNative::Sleep, INT32 iTime)
 }
 FCIMPLEND
 
-FCIMPL1(INT32, ThreadNative::GetManagedThreadId, ThreadBaseObject* th) {
-    FCALL_CONTRACT;
-
-    FC_GC_POLL_NOT_NEEDED();
-    if (th == NULL)
-        FCThrow(kNullReferenceException);
-
-    return th->GetManagedThreadId();
-}
-FCIMPLEND
-
 NOINLINE static Object* GetCurrentThreadHelper()
 {
     FCALL_CONTRACT;

src/coreclr/vm/comsynchronizable.h

@@ -69,7 +69,6 @@ friend class ThreadBaseObject;
 #endif // FEATURE_COMINTEROP_APARTMENT_SUPPORT
 
 
-    static FCDECL1(INT32,   GetManagedThreadId, ThreadBaseObject* th);
     static FCDECL0(INT32,   GetOptimalMaxSpinWaitsPerSpinIteration);
     static FCDECL1(void,    SpinWait,                       int iterations);
     static FCDECL0(Object*, GetCurrentThread);

src/coreclr/vm/ecalllist.h

@@ -371,7 +371,6 @@ FCFuncStart(gThreadFuncs)
     FCFuncElement("Initialize", ThreadNative::Initialize)
     FCFuncElement("SpinWaitInternal", ThreadNative::SpinWait)
     FCFuncElement("GetCurrentThreadNative", ThreadNative::GetCurrentThread)
-    FCFuncElement("get_ManagedThreadId", ThreadNative::GetManagedThreadId)
     FCFuncElement("InternalFinalize", ThreadNative::Finalize)
     FCFuncElement("get_IsAlive", ThreadNative::IsAlive)
     FCFuncElement("IsBackgroundNative", ThreadNative::IsBackground)

src/coreclr/vm/object.h

@@ -1343,12 +1343,6 @@ class ThreadBaseObject : public Object
     void SetInternal(Thread *it);
     void ClearInternal();
 
-    INT32 GetManagedThreadId()
-    {
-        LIMITED_METHOD_CONTRACT;
-        return m_ManagedThreadId;
-    }
-
     void SetManagedThreadId(INT32 id)
     {
         LIMITED_METHOD_CONTRACT;