[MLIR] Set LLVM_LIT_ARGS in Standalone Example CMake (#152423)

Setting LLVM_LIT_ARGS to include --quiet and then running check-mlir in
a standard checkout will otherwise cause test failures here because
LLVM_LIT_ARGS gets propagated into this project.

Author: boomanaiden154

mlir/examples/standalone/CMakeLists.txt

@@ -8,6 +8,10 @@ set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to conform to")
 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   find_package(MLIR REQUIRED CONFIG)
 
+
+  # Define the default argument to use by `lit` when testing.
+  set(LLVM_LIT_ARGS "-sv" CACHE STRING "Default options for lit")
+
   message(STATUS "Using MLIRConfig.cmake in: ${MLIR_DIR}")
   message(STATUS "Using LLVMConfig.cmake in: ${LLVM_DIR}")