tests: enable a few tests for arm64 (and other non x86_64 64-bit) CPUs

The original intention of those REQUIRE lines where to limit the tests to run on 64 bit architectures.

Author: eeckstein

test/IRGen/objc_block_consumed.swift

@@ -7,7 +7,7 @@
 // We want to test that IRGen doesn't assert on this code. SIL is the best place
 // to file check that the block parameter is actually +1.
 
-// REQUIRES: CPU=x86_64
+// REQUIRES: PTRSIZE=64
 // REQUIRES: objc_interop
 
 import gizmo

test/SILOptimizer/escape_analysis_release_hoisting.sil

@@ -1,5 +1,5 @@
 // RUN: %target-sil-opt -enable-sil-verify-all -release-hoisting %s | %FileCheck %s
-// REQUIRES: CPU=x86_64
+// REQUIRES: PTRSIZE=64
 // REQUIRES: OS=macosx
 
 sil_stage canonical

test/SILOptimizer/specialize_opaque_result_types.sil

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend -disable-availability-checking %S/Inputs/opaque_result_types.swift -module-name External -emit-module -emit-module-path %t/External.swiftmodule
 // RUN: %target-sil-opt -I %t -enable-sil-verify-all %s -generic-specializer | %FileCheck %s
 
-// REQUIRES: CPU=x86_64
+// REQUIRES: PTRSIZE=64
 
 import Builtin
 import Swift

test/SILOptimizer/specialize_opaque_result_types_ossa.sil

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend -disable-availability-checking %S/Inputs/opaque_result_types.swift -module-name External -emit-module -emit-module-path %t/External.swiftmodule
 // RUN: %target-sil-opt -I %t -enable-sil-verify-all %s -generic-specializer | %FileCheck %s
 
-// REQUIRES: CPU=x86_64
+// REQUIRES: PTRSIZE=64
 
 import Builtin
 import Swift