[cleanup] Remove install_post_deps_pytorch_xla (#9027)

Author: tengyifei

.circleci/build.sh

@@ -44,10 +44,6 @@ python -c "import fcntl; fcntl.fcntl(1, fcntl.F_SETFL, 0)"
 export USE_CUDA=1
 python setup.py install
 
-if ! install_post_deps_pytorch_xla; then
-  exit 1
-fi
-
 sccache --show-stats
 
 source $XLA_DIR/xla_env

.circleci/common.sh

@@ -105,13 +105,6 @@ function install_pre_deps_pytorch_xla() {
   fi
 }
 
-
-# TODO(https://github.com/pytorch/xla/issues/8934): Remove PyTorch usage of this function, then
-# remove this function from the script.
-function install_post_deps_pytorch_xla() {
-  true
-}
-
 function build_torch_xla() {
   XLA_DIR=$1
   pushd "$XLA_DIR"