Codelens for IEnumerable uses all CPU resources

[leo-labs]

Issue Description

I am working on a medium project that has lots of classes that implement IEnumerable<T>. Rendering the codelens references for the GetEnumerator implementations uses so much CPU that vscode is barely usable if a file with an IEnumerable implementation is open. For me it does not seem to make much sense to render those reference at all, as they point to the interface usages. This is similar to #3243.

Steps to Reproduce

Expected Behavior

Actual Behavior

Logs

OmniSharp log

Post the output from Output-->OmniSharp log here

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.51.1
C# Extension: 1.23.6

Mono Information

OmniSharp using built-in mono

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.1.201 Commit: b1768b4ae7

Runtime Environment:
OS Name: Mac OS X
OS Version: 10.14
OS Platform: Darwin
RID: osx.10.14-x64
Base Path: /usr/local/share/dotnet/sdk/3.1.201/

Host (useful for support):
Version: 3.1.3
Commit: 4a9f85e9f8

.NET Core SDKs installed:
2.2.105 [/usr/local/share/dotnet/sdk]
2.2.402 [/usr/local/share/dotnet/sdk]
3.0.100 [/usr/local/share/dotnet/sdk]
3.1.102 [/usr/local/share/dotnet/sdk]
3.1.201 [/usr/local/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.2.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.2.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.7 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.2 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.3 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.2.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.7 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.2 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.3 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
addlocalnetreferences	RafisTatar	0.4.8
auto-using	Fudge	0.7.15
code-runner	formulahendry	0.11.1
csharp	ms-dotnettools	1.23.6
debugger-for-chrome	msjsdiag	4.12.11
docomment	k--kato	0.1.19
dotnet	leo-labs	1.3.0
dotnet-test-explorer	formulahendry	0.7.4
EditorConfig	EditorConfig	0.16.3
gitlens	eamodio	11.0.5
monkey-patch	iocave	0.1.11
render-crlf	medo64	1.5.16
vetur	octref	0.30.3
vscode-apollo	apollographql	1.17.0
vscode-eslint	dbaeumer	2.1.13