stdlib: add a semantic attribute to Bool.init(_builtinBooleanLiteral:)

This is required for being able to constant fold boolean literals before the DefiniteInitialization pass

Author: eeckstein

stdlib/public/core/Bool.swift

@@ -143,6 +143,7 @@ public struct Bool: Sendable {
 
 extension Bool: _ExpressibleByBuiltinBooleanLiteral, ExpressibleByBooleanLiteral {
   @_transparent
+  @_semantics("bool.literal_init")
   public init(_builtinBooleanLiteral value: Builtin.Int1) {
     self._value = value
   }