Specify folder for git clone in compile-pytorch-ipex.sh; update IPEX pin (#2763)

Closes #2651

---------

Signed-off-by: Anatoly Myachev <[email protected]>

Author: anmyachev

.github/pins/ipex.txt

@@ -1 +1 @@
-cd132db4e11fbf799a2d3ed2afea100a4afd4efd
+15ef7db18b0a50101b41d9c78780d35ea7937ffc

scripts/compile-pytorch-ipex.sh

@@ -106,8 +106,7 @@ if [[ $BUILD_PYTORCH = true ]]; then
   rm -rf $PYTORCH_PROJ
 
   echo "**** Cloning $PYTORCH_PROJ ****"
-  cd $BASE
-  git clone --single-branch -b dev/triton-test-3.0 --recurse-submodules --jobs 8 https://github.com/Stonepia/pytorch.git
+  git clone --single-branch -b dev/triton-test-3.0 --recurse-submodules --jobs 8 https://github.com/Stonepia/pytorch.git $PYTORCH_PROJ
 
   cd $PYTORCH_PROJ