Fixup IRGen Tests on AS Hosts

Author: CodaFi

test/IRGen/fixed_class_initialization.swift

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend -target x86_64-apple-macosx10.14 -module-name main -emit-ir %s | %FileCheck --check-prefix=CHECK --check-prefix=NO_OPT_SELF %s
 
 // REQUIRES: objc_interop
-// REQUIRES: OS=macosx
+// REQUIRES: OS=macosx && CPU=x86_64
 
 class C {
   var x: Int = 0

test/IRGen/macosx-sdk-version.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend %s -target x86_64-apple-macosx10.14 -target-sdk-version 10.15.4 -emit-ir | %FileCheck %s
+// RUN: %target-swift-frontend %s -target %target-cpu-apple-macosx10.14 -target-sdk-version 10.15.4 -emit-ir | %FileCheck %s
 
 // REQUIRES: OS=macosx
 

test/IRGen/opaque_result_type_availability.swift

@@ -1,6 +1,6 @@
-// RUN: %target-swift-frontend -enable-implicit-dynamic -target x86_64-apple-macosx10.9 -Onone -emit-ir %s | %FileCheck --check-prefix=MAYBE-AVAILABLE %s
+// RUN: %target-swift-frontend -enable-implicit-dynamic -target %target-cpu-apple-macosx10.9 -Onone -emit-ir %s | %FileCheck --check-prefix=MAYBE-AVAILABLE %s
 // RUN: %target-swift-frontend -enable-implicit-dynamic -target %target-cpu-apple-macosx10.15 -Onone -emit-ir %s | %FileCheck --check-prefix=ALWAYS-AVAILABLE %s
-// REQUIRES: OS=macosx
+// REQUIRES: OS=macosx && CPU=x86_64
 
 protocol P {}
 extension Int: P {}