[test] REQUIRE cpu arm64 when testing arm64 flags.

3405691582 · 3405691582 · commit f39b4b5d3f05 · 2020-02-22T23:42:18.000-05:00
If llvm-targets-to-build doesn't include AArch64, then this test fails
unhelpfully because architecture-specific flags are missing.
diff --git a/test/Serialization/android-modules.swift b/test/Serialization/android-modules.swift
@@ -1,3 +1,4 @@
+// REQUIRES: CPU=arm64
 // RUN: %empty-directory(%t)
 // RUN: %swift_driver_plain --driver-mode=swiftc -target aarch64-unknown-linux-android -c %s -parse-stdlib -module-name Swift -emit-module -emit-module-path %t/Swift.swiftmodule
 // RUN: %swift_driver_plain --driver-mode=swiftc -O -target aarch64-unknown-linux-android21 -c %s -I %t

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+// REQUIRES: CPU=arm64`
`1`	`2`	`// RUN: %empty-directory(%t)`
`2`	`3`	`// RUN: %swift_driver_plain --driver-mode=swiftc -target aarch64-unknown-linux-android -c %s -parse-stdlib -module-name Swift -emit-module -emit-module-path %t/Swift.swiftmodule`
`3`	`4`	`// RUN: %swift_driver_plain --driver-mode=swiftc -O -target aarch64-unknown-linux-android21 -c %s -I %t`