!fixup! Remove added AggressiveInlining requests

- new `[MethodImpl(...)]` attributes have downsides
- also don't match `[StackTraceHidden]` semantics

Author: dougbu

src/System.Net.Http.Formatting/Internal/TranscodingStream.cs

@@ -465,8 +465,6 @@ public override void SetLength(long value)
 
 #if NET6_0_OR_GREATER
         [StackTraceHidden]
-#else
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
 #endif
         private void ThrowIfDisposed()
         {
@@ -479,8 +477,6 @@ private void ThrowIfDisposed()
         [DoesNotReturn]
 #if NET6_0_OR_GREATER
         [StackTraceHidden]
-#else
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
 #endif
         private void ThrowObjectDisposedException()
         {