[stdlib] remove pointer conversion from inlined runtime code #68715
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This removes an inout-to-pointer conversion for inlinable runtime code that is completely expressed in Swift.
If pointer conversions were to be completely disallowed in pure Swift code, the presence of this pointer conversion in a pre-existing standard library would prevent the compiler from building from scratch.
After this change, we get the same generated assembly as before when compiling in release mode.
Addresses rdar://115912430