[SE-0382] Stage in prototypes of macros defined in the standard library.

This are inactive at the moment; we'll conditionally take advantage of them
later on. Part of rdar://104346457.

Author: DougGregor

stdlib/public/core/Macros.swift

@@ -10,7 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#if compiler(>=5.8) && hasAttribute(freestanding)
 /// Specifies the module and type name for an externally-defined macro, which
 /// must conform to the appropriate set of `Macro` protocols.
 ///
@@ -24,4 +23,40 @@
 public macro externalMacro<T>(module: String, type: String) -> T =
     Builtin.ExternalMacro
 
-#endif
+// File and path-related information
+
+/// Produces a unique identifier for the given source file, comprised of
+/// the module and file name.
+@freestanding(expression)
+public macro fileID<T: ExpressibleByStringLiteral>() -> T =
+  Builtin.FileIDMacro
+
+/// Produces the complete path for the given source file.
+@freestanding(expression)
+public macro filePath<T: ExpressibleByStringLiteral>() -> T =
+  Builtin.FilePathMacro
+
+/// Produces either the result of `#filePath` or `#file`, depending
+/// on whether concise file paths (SE-0274) are enabled.
+@freestanding(expression)
+public macro file<T: ExpressibleByStringLiteral>() -> T =
+  Builtin.FileMacro
+
+/// Produces a string representation of the current function name.
+@freestanding(expression)
+public macro function<T: ExpressibleByStringLiteral>() -> T =
+  Builtin.FunctionMacro
+
+/// Produces the line number at which the macro is expanded.
+@freestanding(expression)
+public macro line<T: ExpressibleByIntegerLiteral>() -> T =
+  Builtin.LineMacro
+
+/// Produces the column number at which the macro is expanded.
+@freestanding(expression)
+public macro column<T: ExpressibleByIntegerLiteral>() -> T =
+  Builtin.ColumnMacro
+
+/// Produces the shared object handle for the macro expansion location.
+@freestanding(expression)
+public macro dsohandle() -> UnsafeRawPointer = Builtin.DSOHandleMacro