Are throw helpers really more efficient?

### Type of issue

Typo

### Description

From https://learn.microsoft.com/en-us/dotnet/core/whats-new/dotnet-8/sdk#code-analysis

> Throw helpers are simpler **and more efficient** than an if block constructing a new exception instance.

Having look at https://github.com/dotnet/runtime/blob/5535e31a712343a63f5d7d796cd874e563e5ac14/src/libraries/System.Private.CoreLib/src/System/ArgumentNullException.cs, I see that in order to throw 2 methods are called and no optimization which could be more efficient than simple `if`-then construct.

### Page URL

https://learn.microsoft.com/en-us/dotnet/core/whats-new/dotnet-8/sdk

### Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/whats-new/dotnet-8/sdk.md

### Document Version Independent Id

2dd1bc19-cfa0-3d7d-4931-1f0f4fefac12

### Article author

@gewarren

### Metadata

* ID: 0b25da3d-7bbf-d16d-3caf-e56923fe9716
* Service: **dotnet-fundamentals**

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