Fix creating RegionInfo object using names with different casing.

[tarekgh]

Fixes#39991

[ghost]

Tagging subscribers to this area: @tarekgh, @safern, @krwq
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[tarekgh]

The failures showing in System.Net.Http.WinHttpHandler.Functional.Tests but when looking at the logs, the test looks succeeded.
https://helix.dot.net/api/2019-06-17/jobs/6b514377-c659-427c-892c-d5b30caa1fe9/workitems/System.Net.Http.WinHttpHandler.Functional.Tests/console

@MattGal is this infrastructure known issue?

[safern]

Actually there seems to be 1 test failure but since there are some skipped tests is somewhat hidden:

System.Net.Http.Functional.Tests.PlatformHandler_HttpClientHandlerTest.SendAsync_Expect100Continue_RequestBodyFails_ThrowsContentException [FAIL]
System.Net.Sockets.SocketException : An existing connection was forcibly closed by the remote host.
Stack Trace:
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Tasks.cs(439,0): at System.Net.Sockets.Socket.GetException(SocketError error, Boolean wrapExceptionsInIOExceptions)
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Tasks.cs(403,0): at System.Net.Sockets.Socket.CompleteAccept(Socket s, TaskSocketAsyncEventArgs`1 saea)
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Tasks.cs(41,0): at System.Net.Sockets.Socket.<>c.<AcceptAsync>b__287_0(Object s, SocketAsyncEventArgs e)
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.cs(203,0): at System.Net.Sockets.SocketAsyncEventArgs.OnCompleted(SocketAsyncEventArgs e)
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.cs(643,0): at System.Net.Sockets.SocketAsyncEventArgs.FinishOperationAsyncFailure(SocketError socketError, Int32 bytesTransferred, SocketFlags flags)
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.Windows.cs(1271,0): at System.Net.Sockets.SocketAsyncEventArgs.HandleCompletionPortCallbackError(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
/_/src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEventArgs.Windows.cs(1233,0): at System.Net.Sockets.SocketAsyncEventArgs.<>c.<.cctor>b__177_0(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
/_/src/coreclr/src/System.Private.CoreLib/src/System/Threading/Overlapped.cs(62,0): at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pNativeOverlapped)
...

But seems known/unrelated.

[tarekgh]

Good catch @safern. looks I need new glasses :-)

I logged the issue #40057 to track fixing that.