off-by-default & fix tests

Author: David Ungar

test/Driver/advanced_output_file_map.swift

@@ -82,7 +82,7 @@
 // BINDINGS-ENA: # "x86_64-apple-macosx10.9" - "ld{{(.exe)?}}", inputs: ["./obj/advanced_output_file_map.o", "./obj/main.o", "./obj/lib.o", "./OutputFileMap.swiftmodule"], output: {image: "./advanced_output_file_map.out"}
 // BINDINGS-ENA: # "x86_64-apple-macosx10.9" - "dsymutil{{(\.exe)?}}", inputs: ["./advanced_output_file_map.out"], output: {dSYM: "./advanced_output_file_map.out.dSYM"}
 
-// Defaulting to: -disable-only-one-dependency-file
+// Defaulting to: -enable-only-one-dependency-file
 
 // RUN: %swiftc_driver -driver-print-output-file-map -target x86_64-apple-macosx10.9 -emit-executable -emit-module -serialize-diagnostics %/s %/S/Inputs/main.swift %/S/Inputs/lib.swift -g -o ./advanced_output_file_map.out -emit-module-path ./OutputFileMap.swiftmodule -module-name OutputFileMap -output-file-map %t/ofm.json 2>&1 | %FileCheck %/s -check-prefix=DUMPOFM-DIS
 
@@ -91,5 +91,5 @@
 // RUN: %swiftc_driver -driver-print-bindings -target x86_64-apple-macosx10.9 -emit-executable -emit-module -serialize-diagnostics -emit-dependencies %/s %/S/Inputs/main.swift %/S/Inputs/lib.swift -g -o ./advanced_output_file_map.out -emit-module-path ./OutputFileMap.swiftmodule -module-name OutputFileMap -output-file-map %t/ofm.json 2>&1 | %FileCheck %/s -check-prefix=BINDINGS-DIS
 // Should be no dummy files:
 // RUN: test ! -e %t/d/advanced_output_file_map.d
-// RUN: test ! -e %t/d/main.d
-// RUN: test ! -e %t/d/lib.d
+// RUN: test -e %t/d/main.d -a ! -s %t/d/main.d
+// RUN: test -e %t/d/lib.d  -a ! -s %t/d/lib.d