Merge pull request #19697 from nkcsgexi/effective-access

swift-module-digester: use getEffectiveAccess() to get accessibility when checking ABI stability.

Author: nkcsgexi

test/api-digester/Inputs/cake.swift

@@ -88,3 +88,6 @@ public extension P1 {
 }
 
 infix operator ..*..
+
+@usableFromInline
+class UsableFromInlineClass {}

test/api-digester/Inputs/cake1.swift

@@ -55,8 +55,9 @@ public struct fixedLayoutStruct {
   public var a = 1
 }
 
+@usableFromInline
 @_fixed_layout
-public struct fixedLayoutStruct2 {
+struct fixedLayoutStruct2 {
   public private(set) var NoLongerWithFixedBinaryOrder = 1
   public var BecomeFixedBinaryOrder: Int { return 1 }
 }

test/api-digester/Inputs/cake2.swift

@@ -59,8 +59,9 @@ public struct fixedLayoutStruct {
   private lazy var lazy_d = 4
 }
 
+@usableFromInline
 @_fixed_layout
-public struct fixedLayoutStruct2 {
+struct fixedLayoutStruct2 {
   public var NoLongerWithFixedBinaryOrder: Int { return 1 }
   public var BecomeFixedBinaryOrder = 1
 }