[Serialization] Fix missing target in driver invocation

Author: xymus

test/Sema/implementation-only-import-suggestion.swift

@@ -1,6 +1,5 @@
 // RUN: %empty-directory(%t)
 // REQUIRES: VENDOR=apple
-// REQUIRES: OS=macosx
 
 /// Prepare the SDK.
 // RUN: cp -r %S/Inputs/public-private-sdk %t/sdk
@@ -22,7 +21,7 @@
 // RUN:   -library-level spi -D PUBLIC_IMPORTS
 
 /// The driver should also accept the flag and pass it along.
-// RUN: %swiftc_driver -typecheck -sdk %t/sdk -module-cache-path %t %s \
+// RUN: %target-swiftc_driver -typecheck -sdk %t/sdk -module-cache-path %t %s \
 // RUN:   -F %t/sdk/System/Library/PrivateFrameworks/ \
 // RUN:   -library-level spi -D PUBLIC_IMPORTS