[cling][CI] Enable LLVM assertions when testing

(cherry picked from commit 7b34547)

Author: devajithvs

interpreter/cling/.github/workflows/cling.yml

@@ -39,7 +39,14 @@ jobs:
 
       - name: Configure
         working-directory: build
-        run: cmake -DLLVM_EXTERNAL_PROJECTS=cling -DLLVM_EXTERNAL_CLING_SOURCE_DIR=../cling/ -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_TARGETS_TO_BUILD="host;NVPTX" -DCMAKE_BUILD_TYPE=Release ../llvm/llvm/
+        run: |
+          cmake ../llvm/llvm/ \
+            -DLLVM_EXTERNAL_PROJECTS=cling \
+            -DLLVM_EXTERNAL_CLING_SOURCE_DIR=../cling/ \
+            -DLLVM_ENABLE_PROJECTS="clang" \
+            -DLLVM_TARGETS_TO_BUILD="host;NVPTX" \
+            -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+            -DLLVM_ENABLE_ASSERTIONS=ON
 
       - name: Build
         working-directory: build