Workaround for test/AutoDiff/array.swift.

`-Xfrontend -enable-ownership-stripping-after-serialization` for swiftCore
causes test/AutoDiff/array.swift to crash (regarding calls to
`Array.recursivelyAllKeyPaths`).

SR-11336 seems related and is reproducible from master.
Disabling flag for swiftCore (and all other standard library modules) until
SR-11336 is resolved.

Temporarily disable affected test SILOptimizer/pound_assert.swift.
TF-799 tracks re-enabling the test.

Author: dan-zheng

cmake/modules/SwiftSource.cmake

@@ -236,8 +236,13 @@ function(_compile_swift_files
     if(NOT "${SWIFTFILE_MODULE_NAME}" STREQUAL "TensorFlow" AND
        NOT "${SWIFTFILE_MODULE_NAME}" STREQUAL "DifferentiationUnittest")
       list(APPEND swift_flags "-enable-library-evolution")
-      list(APPEND swift_flags "-Xfrontend" "-enable-ownership-stripping-after-serialization")
     endif()
+    # FIXME(SR-11336): `-enable-ownership-stripping-after-serialization` for
+    # swiftCore causes test/AutoDiff/array.swift to crash, related to
+    # Array and key paths.
+    # Disabling the flag for swiftCore requires disabling the flag for all
+    # other standard library modules.
+    # list(APPEND swift_flags "-Xfrontend" "-enable-ownership-stripping-after-serialization")
   endif()
 
   if(SWIFT_STDLIB_USE_NONATOMIC_RC)

test/SILOptimizer/pound_assert.swift

@@ -1,5 +1,7 @@
 // RUN: %target-swift-frontend -enable-experimental-static-assert -emit-sil %s -verify
-// RUN: %target-swift-frontend -enable-experimental-static-assert -enable-ownership-stripping-after-serialization -emit-sil %s -verify
+// SWIFT_ENABLE_TENSORFLOW
+// TODO(TF-799): Re-enable RUN line after SR-11336 is fixed.
+// UN: %target-swift-frontend -enable-experimental-static-assert -enable-ownership-stripping-after-serialization -emit-sil %s -verify
 
 // REQUIRES: optimized_stdlib
 // REQUIRES: asserts