test: add a test for using SPI in inlinable function body

Author: nkcsgexi

test/Sema/spi-available-inline.swift

@@ -0,0 +1,13 @@
+// REQUIRES: VENDOR=apple
+// RUN: %target-typecheck-verify-swift -target x86_64-apple-macosx11.9
+
+@_spi_available(macOS 10.4, *)
+public class MacOSSPIClass { public init() {} }
+
+@_spi_available(iOS 8.0, *)
+public class iOSSPIClass { public init() {} }
+
+@inlinable public func foo() {
+	_ = MacOSSPIClass() // expected-error {{class 'MacOSSPIClass' cannot be used in an '@inlinable' function because it is SPI}}
+	_ = iOSSPIClass()
+}