Disable bounds safety APINotes tests on non-darwin platforms

These test cases use clang modules. TypeCoupledDeclRefInfo
serialization/deserialization is currently broken on Linux, so disable
these tests until it's been resolved.

Author: hnrklssn

clang/test/APINotes/boundssafety-errors.c

@@ -1,3 +1,6 @@
+// rdar://144275431: Clang module support for TypeCoupledDeclRefInfo is broken on Linux
+// REQUIRES: system-darwin
+
 // RUN: rm -rf %t && mkdir -p %t
 // RUN: split-file %s %t/Headers
 // RUN: not %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache -fsyntax-only -fapinotes-modules -I %t/Headers -fexperimental-bounds-safety-attributes %t/Headers/SemaErrors.c 2>&1 | FileCheck %s

clang/test/APINotes/boundssafety.c

@@ -1,3 +1,6 @@
+// rdar://144275431: Clang module support for TypeCoupledDeclRefInfo is broken on Linux
+// REQUIRES: system-darwin
+
 // RUN: rm -rf %t && mkdir -p %t
 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache -fsyntax-only -fapinotes-modules -I %S/Inputs/Headers -F %S/Inputs/Frameworks -fexperimental-bounds-safety-attributes %s -ast-dump -ast-dump-filter asdf | FileCheck %s
 

clang/test/APINotes/boundssafety.m

@@ -1,3 +1,6 @@
+// rdar://144275431: Clang module support for TypeCoupledDeclRefInfo is broken on Linux
+// REQUIRES: system-darwin
+
 // RUN: rm -rf %t && mkdir -p %t
 
 // RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t/ModulesCache -fsyntax-only -fapinotes-modules -I %S/Inputs/Headers -F %S/Inputs/Frameworks -fexperimental-bounds-safety-attributes %s -ast-dump -ast-dump-filter asdf | FileCheck %s