`@discardableResult` doesn't work with computed property getter

[li3zhen1]

Description

No response

Reproduction

struct S {
    var discardableGetter: Int {
        @discardableResult
        get {
            return 0
        }
    }
}

func test() {
    S().discardableGetter
}

../discardableGetter.swift:11:9: warning: expression of type 'Int' is unused
 9 │
10 │ func test() {
11 │     S().discardableGetter
   │         ╰─ warning: expression of type 'Int' is unused
12 │ }

Expected behavior

@discardableResult could suppress this warning.

Environment

swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0

also occur in nightly:

Swift version 6.0-dev (LLVM a8cd54c4da01fef, Swift e738059)
Target: arm64-apple-macosx14.0

Additional information

Similar to #71870 .