[clang][Fuchsia] Add additional unit test for availability attr

This change adds additional unit tests for availability attribute
support for Fuchsia platform.

Differential Revision: https://reviews.llvm.org/D112271

Author: zeroomega

clang/test/Sema/attr-availability-fuchsia.c

@@ -11,17 +11,19 @@
 void f0(int) __attribute__((availability(fuchsia, introduced = 14, deprecated = 19)));
 void f1(int) __attribute__((availability(fuchsia, introduced = 16)));
 void f2(int) __attribute__((availability(fuchsia, introduced = 14, deprecated = 16))); // expected-note {{'f2' has been explicitly marked deprecated here}}
-void f3(int) __attribute__((availability(fuchsia, introduced = 19)));
+void f3(int) __attribute__((availability(fuchsia, introduced = 19, strict))); // expected-note {{'f3' has been explicitly marked unavailable here}}
 void f4(int) __attribute__((availability(fuchsia, introduced = 9, deprecated = 11, obsoleted = 16), availability(ios, introduced = 2.0, deprecated = 3.0))); // expected-note{{explicitly marked unavailable}}
 void f5(int) __attribute__((availability(ios, introduced = 3.2), availability(fuchsia, unavailable)));                                                       // expected-note{{'f5' has been explicitly marked unavailable here}}
 void f6(int) __attribute__((availability(fuchsia, introduced = 16.0)));                                                                                      // expected-warning {{Fuchsia API Level prohibits specifying a minor or sub-minor version}}
 void f7(int) __attribute__((availability(fuchsia, introduced = 16.1))); // expected-warning {{Fuchsia API Level prohibits specifying a minor or sub-minor version}}
+void f8(int) __attribute__((availability(fuchsia, introduced = 19))); // nothing will happen as 'strict' is not specified.
 
 void test() {
   f0(0);
   f1(0);
   f2(0); // expected-warning{{'f2' is deprecated: first deprecated in Fuchsia 16}}
-  f3(0);
+  f3(0); // expected-error{{'f3' is unavailable: introduced in Fuchsia 19}}
   f4(0); // expected-error{{f4' is unavailable: obsoleted in Fuchsia 16}}
   f5(0); // expected-error{{'f5' is unavailable: not available on Fuchsia}}
+  f8(0);
 }