Add alwayslink=1 to :tf32_utils target.
This fixes TF Serving OSS builds that presently fail with this error:
```
ERROR: /tmpfs/tmp/bazel/external/org_tensorflow/tensorflow/python/keras/api/BUILD:123:1: Couldn't build file external/org_tensorflow/tensorflow/python/keras/api/_v1/__init__.py: Executing genrule @org_tensorflow//tensorflow/python/keras/api:keras_python_api_gen_compat_v1 failed (Exit 1): bash failed: error executing command
ImportError: /tmpfs/tmp/bazel/execroot/tf_serving/bazel-out/host/bin/external/org_tensorflow/tensorflow/python/keras/api/create_tensorflow.python_api_keras_python_api_gen_compat_v1.runfiles/org_tensorflow/tensorflow/python/_pywrap_tf32_execution.so: undefined symbol: _ZN10tensorflow20allow_tf32_executionEb
ERROR: /tmpfs/tmp/bazel/external/org_tensorflow/tensorflow/python/keras/api/BUILD:137:1: Couldn't build file external/org_tensorflow/tensorflow/python/keras/api/_v2/__init__.py: Executing genrule @org_tensorflow//tensorflow/python/keras/api:keras_python_api_gen_compat_v2 failed (Exit 1): bash failed: error executing command
ImportError: /tmpfs/tmp/bazel/execroot/tf_serving/bazel-out/host/bin/external/org_tensorflow/tensorflow/python/keras/api/create_tensorflow.python_api_keras_python_api_gen_compat_v2.runfiles/org_tensorflow/tensorflow/python/_pywrap_tf32_execution.so: undefined symbol: _ZN10tensorflow20allow_tf32_executionEb
```
PiperOrigin-RevId: 321802109
Change-Id: I76ba18f0c5d99b5780c34590c0c337000e8cdb30
diff --git a/tensorflow/core/platform/BUILD b/tensorflow/core/platform/BUILD
index ec5d1a5..9722ba8 100644
--- a/tensorflow/core/platform/BUILD
+++ b/tensorflow/core/platform/BUILD
@@ -951,6 +951,7 @@
srcs = ["tf32_utils.cc"],
hdrs = ["tf32_utils.h"],
copts = tf_copts(),
+ alwayslink = 1,
)
filegroup(
