[Backtracing][Tests] Fix tests to redirect output from stderr.

Some of the backtracing tests expected output on stdout.

rdar://110371557

test/Backtracing/Crash.swift

@@ -7,11 +7,11 @@
 // RUN: %target-codesign %t/CrashNoDebug
 // RUN: %target-codesign %t/CrashOpt
 // RUN: %target-codesign %t/CrashOptNoDebug
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/Crash || true) | %FileCheck %s
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/Crash 2>&1 || true) | %FileCheck %s
 // RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/Crash || true) | %FileCheck %s --check-prefix FRIENDLY
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashNoDebug || true) | %FileCheck %s --check-prefix NODEBUG
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashOpt || true) | %FileCheck %s --check-prefix OPTIMIZED
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashOptNoDebug || true) | %FileCheck %s --check-prefix OPTNODEBUG
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashNoDebug 2>&1 || true) | %FileCheck %s --check-prefix NODEBUG
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashOpt 2>&1 || true) | %FileCheck %s --check-prefix OPTIMIZED
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashOptNoDebug 2>&1 || true) | %FileCheck %s --check-prefix OPTNODEBUG
 
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: back_deployment_runtime

test/Backtracing/CrashAsync.swift

@@ -5,8 +5,8 @@
 // Demangling is disabled for now because older macOS can't demangle async
 // function names. We test demangling elsewhere, so this is no big deal.
 
-// RUN: (env SWIFT_BACKTRACE=enable=yes,demangle=no,cache=no %target-run %t/CrashAsync || true) | %FileCheck %s
-// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,demangle=no,cache=no %target-run %t/CrashAsync || true) | %FileCheck %s --check-prefix FRIENDLY
+// RUN: (env SWIFT_BACKTRACE=enable=yes,demangle=no,cache=no %target-run %t/CrashAsync 2>&1 || true) | %FileCheck %s
+// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,demangle=no,cache=no %target-run %t/CrashAsync 2>&1 || true) | %FileCheck %s --check-prefix FRIENDLY
 
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: back_deployment_runtime

test/Backtracing/CrashWithThunk.swift

@@ -1,8 +1,8 @@
 // RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -parse-as-library -Onone -g -o %t/CrashWithThunk
 // RUN: %target-codesign %t/CrashWithThunk
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashWithThunk || true) | %FileCheck %s
-// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/CrashWithThunk || true) | %FileCheck %s --check-prefix FRIENDLY
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/CrashWithThunk 2>&1 || true) | %FileCheck %s
+// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/CrashWithThunk 2>&1 || true) | %FileCheck %s --check-prefix FRIENDLY
 
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: back_deployment_runtime

test/Backtracing/Overflow.swift

@@ -1,8 +1,8 @@
 // RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -parse-as-library -Onone -g -o %t/Overflow
 // RUN: %target-codesign %t/Overflow
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/Overflow || true) | %FileCheck %s
-// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/Overflow || true) | %FileCheck %s --check-prefix FRIENDLY
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/Overflow 2>&1 || true) | %FileCheck %s
+// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/Overflow 2>&1 || true) | %FileCheck %s --check-prefix FRIENDLY
 
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: back_deployment_runtime

test/Backtracing/StackOverflow.swift

@@ -1,9 +1,9 @@
 // RUN: %empty-directory(%t)
 // RUN: %target-build-swift %s -parse-as-library -Onone -g -o %t/StackOverflow
 // RUN: %target-codesign %t/StackOverflow
-// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/StackOverflow || true) | %FileCheck %s
-// RUN: (env SWIFT_BACKTRACE=limit=16,top=4,enable=yes,cache=no %target-run %t/StackOverflow || true) | %FileCheck %s --check-prefix LIMITED
-// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/StackOverflow || true) | %FileCheck %s --check-prefix FRIENDLY
+// RUN: (env SWIFT_BACKTRACE=enable=yes,cache=no %target-run %t/StackOverflow 2>&1 || true) | %FileCheck %s
+// RUN: (env SWIFT_BACKTRACE=limit=16,top=4,enable=yes,cache=no %target-run %t/StackOverflow 2>&1 || true) | %FileCheck %s --check-prefix LIMITED
+// RUN: (env SWIFT_BACKTRACE=preset=friendly,enable=yes,cache=no %target-run %t/StackOverflow 2>&1 || true) | %FileCheck %s --check-prefix FRIENDLY
 
 // UNSUPPORTED: use_os_stdlib
 // UNSUPPORTED: back_deployment_runtime