[test] Tighten up test/Driver/filelists.swift.

- Stronger CHECK lines.
- Don't try to link when there's a fake frontend.
- Give the fake 'ld' an explicit .py suffix, and use a symlink to access it, which
  uncovered the first two problems.

Author: jrose-apple

test/Driver/Inputs/filelists/ld renamed to test/Driver/Inputs/filelists/fake-ld.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# ld - Fake Darwin linker to test driver-produced -filelists.
+# fake-ld.py - Fake Darwin linker to test driver-produced -filelists.
 #
 # This source file is part of the Swift.org open source project
 #

test/Driver/filelists.swift

@@ -12,25 +12,29 @@
 
 // RUN: %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -c %t/a.swift %t/b.swift %t/c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -force-single-frontend-invocation 2>&1 | FileCheck -check-prefix=CHECK-WMO %s
 
-// CHECK-NOT: Handled
+// CHECK-WMO-NOT: Handled
 // CHECK-WMO: Handled all
-// CHECK-NOT: output
-// CHECK-NOT: Handled
+// CHECK-WMO-NOT: output
+// CHECK-WMO-NOT: Handled
+
 
+// RUN: mkdir %t/bin
+// RUN: ln -s %S/Inputs/filelists/fake-ld.py %t/bin/ld
 
-// RUN: (cd %t && %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -emit-library ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 2>&1 | FileCheck -check-prefix=CHECK-WMO-THREADED %s)
-// RUN: (cd %t && %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -emit-library ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 -embed-bitcode 2>&1 | FileCheck -check-prefix=CHECK-WMO-THREADED %s)
+// RUN: (cd %t && %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -c ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 2>&1 | FileCheck -check-prefix=CHECK-WMO-THREADED %s)
+// RUN: (cd %t && %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -c ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 -embed-bitcode 2>&1 | FileCheck -check-prefix=CHECK-WMO-THREADED %s)
 // RUN: mkdir %t/tmp/
 // RUN: (cd %t && env TMPDIR="%t/tmp/" %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -c ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 -save-temps 2>&1 | FileCheck -check-prefix=CHECK-WMO-THREADED %s)
 // RUN: ls %t/tmp/sources-* %t/tmp/outputs-*
 
-// CHECK-NOT: Handled
+// CHECK-WMO-THREADED-NOT: Handled
 // CHECK-WMO-THREADED: Handled all
 // CHECK-WMO-THREADED-NEXT: ...with output!
-// CHECK-NOT: Handled
+// CHECK-WMO-THREADED-NOT: Handled
+
 
-// RUN: (cd %t && env PATH=%S/Inputs/filelists/:$PATH %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -emit-library ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json 2>&1 | FileCheck -check-prefix=CHECK-LINK %s)
-// RUN: (cd %t && env PATH=%S/Inputs/filelists/:$PATH %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -emit-library ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 2>&1 | FileCheck -check-prefix=CHECK-LINK %s)
+// RUN: (cd %t && env PATH=%t/bin/:$PATH %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -emit-library ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json 2>&1 | FileCheck -check-prefix=CHECK-LINK %s)
+// RUN: (cd %t && env PATH=%t/bin/:$PATH %swiftc_driver_plain -driver-use-frontend-path %S/Inputs/filelists/check-filelist-abc.py -emit-library ./a.swift ./b.swift ./c.swift -module-name main -target x86_64-apple-macosx10.9 -driver-use-filelists -output-file-map=%S/Inputs/filelists/output.json -force-single-frontend-invocation -num-threads 1 2>&1 | FileCheck -check-prefix=CHECK-LINK %s)
 
 // CHECK-LINK: Handled link