Added flag to skip very expensive part of the proof for prvInitialiseNewTask.

When the symbol `VERIFAST_SKIP_BITVECTOR_PROOF__STACK_ALIGNMENT` is defined in the preprocessor script, we skip the verification of the stack alignment. This part of the proof involves bit vector arithmetic and hence takes long to verify.

verification/verifast/custom_build_scripts_RP2040/preprocess_tasks_c.sh

@@ -32,6 +32,9 @@ PP_OUT_DIR="$VF_PROOF_BASE_DIR/preprocessed_files"
 PP_TASK_C="$PP_OUT_DIR/tasks__pp.c"
 
 
+# Flags to SKIP expensive proofs:
+# - VERIFAST_SKIP_BITVECTOR_PROOF__STACK_ALIGNMENT
+
 
 pwd
 mkdir $LOG_PP_OUT_DIR
@@ -44,6 +47,7 @@ mkdir $LOG_PP_OUT_DIR
 echo start preprocessor
 clang -E -C  -DFREE_RTOS_KERNEL_SMP=1 -DLIB_FREERTOS_KERNEL=1 -DLIB_PICO_BIT_OPS=1 -DLIB_PICO_BIT_OPS_PICO=1 -DLIB_PICO_DIVIDER=1 -DLIB_PICO_DIVIDER_HARDWARE=1 -DLIB_PICO_DOUBLE=1 -DLIB_PICO_DOUBLE_PICO=1 -DLIB_PICO_FLOAT=1 -DLIB_PICO_FLOAT_PICO=1 -DLIB_PICO_INT64_OPS=1 -DLIB_PICO_INT64_OPS_PICO=1 -DLIB_PICO_MALLOC=1 -DLIB_PICO_MEM_OPS=1 -DLIB_PICO_MEM_OPS_PICO=1 -DLIB_PICO_MULTICORE=1 -DLIB_PICO_PLATFORM=1 -DLIB_PICO_PRINTF=1 -DLIB_PICO_PRINTF_PICO=1 -DLIB_PICO_RUNTIME=1 -DLIB_PICO_STANDARD_LINK=1 -DLIB_PICO_STDIO=1 -DLIB_PICO_STDIO_UART=1 -DLIB_PICO_STDLIB=1 -DLIB_PICO_SYNC=1 -DLIB_PICO_SYNC_CORE=1 -DLIB_PICO_SYNC_CRITICAL_SECTION=1 -DLIB_PICO_SYNC_MUTEX=1 -DLIB_PICO_SYNC_SEM=1 -DLIB_PICO_TIME=1 -DLIB_PICO_UTIL=1 -DPICO_BOARD=\"pico\" -DPICO_BUILD=1 -DPICO_CMAKE_BUILD_TYPE=\"Release\" -DPICO_COPY_TO_RAM=0 -DPICO_CXX_ENABLE_EXCEPTIONS=0 -DPICO_NO_FLASH=0 -DPICO_NO_HARDWARE=0 -DPICO_ON_DEVICE=1 -DPICO_STACK_SIZE=0x1000 -DPICO_TARGET_NAME=\"on_core_one\" -DPICO_USE_BLOCKED_RAM=0 -DmainRUN_FREE_RTOS_ON_CORE=1 \
 -DVERIFAST \
+-DVERIFAST_SKIP_BITVECTOR_PROOF__STACK_ALIGNMENT \
 -I"$VF_DIR/bin" \
 -I"$PROOF_SETUP_DIR" \
 -I"$PROOF_FILES_DIR" \