Bump llvm and enable building with MLIR Python-bindings (#1036)

Bump of llvm-project is necessary as CI caches llvm-project builds (hence the commit needs to be changed any time we want to make changes to the CI's llvm-project build parameters).

Author: rolfmorel

build_tools/llvm_version.txt

@@ -1 +1 @@
-0f32809139bd104adb2c1de4fa1044da78a7e5af
+a99e055030f0da61651e808cbb208bb39594cdc0

requirements.txt

@@ -1,6 +1,7 @@
 coloredlogs
 matplotlib
 pybind11
+nanobind
 requests
 black
 lit

scripts/github/build_llvm.sh

@@ -101,6 +101,9 @@ if [ "${GPU}" ]; then
   source ${SCRIPT_DIR}/ci/setup_gpu_env.sh
 fi
 
+# Necessary for building Python-bindngs.
+pip install --upgrade --user nanobind pybind11
+
 echo "Environment configured successfully"
 
  # Configure LLVM
@@ -134,6 +137,7 @@ echo_run cmake -Wno-dev -G Ninja \
     -DCMAKE_CXX_COMPILER=${CXX} \
     -DLLVM_USE_LINKER=${LINKER} \
     -DCMAKE_INSTALL_PREFIX=${LLVM_INSTALL_DIR} \
+    -DMLIR_ENABLE_BINDINGS_PYTHON=ON \
     ${LLVM_BUILD_EXTENSIONS}
 
 if [ $? != 0 ]; then