[Tests] Fix LIT prefixes for Driver/linker-clang_rt and update test

The Driver/linker-clang_rt test had some of its run lines with incorrect prefixes.
(For example, the prefix for the iOS tests was 'IOS' rather than 'CHECK-IOS'). The
effect is that the CHECK lines in the test weren't actually used and so little was
being tested.

The commits updates the --prefix arguments so that the CHECK lines are active.
This also updates the test to specify the current behavior: namely that the
compiler-rt path is in "/lib/swift/clang/lib/darwin/" rather than "/lib/clang/darwin/".

I've also updated one of the tvOS lines to use the "tvos" in the target rather than
"ios". I suspect that was typo that wasn't caught the test wasn't running.

Author: devincoughlin

test/Driver/linker-clang_rt.swift

@@ -7,32 +7,32 @@
 // RUN: rm -rf %t
 // RUN: %empty-directory(%t/bin)
 // RUN: %hardlink-or-copy(from: %swift_driver_plain, to: %t/bin/swiftc)
-// RUN: %empty-directory(%t/lib/clang/darwin/)
+// RUN: %empty-directory(%t/lib/swift/clang/lib/darwin/)
 
 // RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-macosx10.9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-NO-RUNTIME %s
 
-// RUN: touch %t/lib/clang/darwin/libclang_rt.osx.a %t/lib/clang/darwin/libclang_rt.ios.a %t/lib/clang/darwin/libclang_rt.tvos.a %t/lib/clang/darwin/libclang_rt.watchos.a
+// RUN: touch %t/lib/swift/clang/lib/darwin/libclang_rt.osx.a %t/lib/swift/clang/lib/darwin/libclang_rt.ios.a %t/lib/swift/clang/lib/darwin/libclang_rt.tvos.a %t/lib/swift/clang/lib/darwin/libclang_rt.watchos.a
 
-// RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-macosx10.9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix MACOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-macosx10.9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-MACOS %s
 
-// RUN: %t/bin/swiftc -driver-print-jobs -target i386-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix IOS %s
-// RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix IOS %s
-// RUN: %t/bin/swiftc -driver-print-jobs -target armv7s-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix IOS %s
-// RUN: %t/bin/swiftc -driver-print-jobs -target arm64-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix IOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target i386-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-IOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-IOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target armv7s-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-IOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target arm64-apple-ios7 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-IOS %s
 
-// RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-ios9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix TVOS %s
-// RUN: %t/bin/swiftc -driver-print-jobs -target arm64-apple-tvos9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix TVOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target x86_64-apple-tvos9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-TVOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target arm64-apple-tvos9 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-TVOS %s
 
-// RUN: %t/bin/swiftc -driver-print-jobs -target i386-apple-watchos2 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix WATCHOS %s
-// RUN: %t/bin/swiftc -driver-print-jobs -target armv7k-apple-watchos2 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix WATCHOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target i386-apple-watchos2 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-WATCHOS %s
+// RUN: %t/bin/swiftc -driver-print-jobs -target armv7k-apple-watchos2 %S/../Inputs/empty.swift | %FileCheck -check-prefix CHECK -check-prefix CHECK-WATCHOS %s
 
 // Clean up the test executable because hard links are expensive.
 // RUN: rm -f %t/bin/swiftc
 
 // CHECK: {{(bin/)?}}ld{{"? }}
 // CHECK-NO-RUNTIME-NOT: libclang_rt
-// CHECK-MACOS-SAME: {{[^ ]+/lib/clang/darwin/libclang_rt.osx.a}}
-// CHECK-IOS-SAME: {{[^ ]+/lib/clang/darwin/libclang_rt.ios.a}}
-// CHECK-TVOS-SAME: {{[^ ]+/lib/clang/darwin/libclang_rt.tvos.a}}
-// CHECK-WATCHOS-SAME: {{[^ ]+/lib/clang/darwin/libclang_rt.watchos.a}}
+// CHECK-MACOS-SAME: {{[^ ]+/lib/swift/clang/lib/darwin/libclang_rt.osx.a}}
+// CHECK-IOS-SAME: {{[^ ]+/lib/swift/clang/lib/darwin/libclang_rt.ios.a}}
+// CHECK-TVOS-SAME: {{[^ ]+/lib/swift/clang/lib/darwin/libclang_rt.tvos.a}}
+// CHECK-WATCHOS-SAME: {{[^ ]+/lib/swift/clang/lib/darwin/libclang_rt.watchos.a}}
 // CHECK-SAME: -o {{[^ ]+}}