[COMPILER/FEATURE] Support rt_packed #4195

Job	Run time
RT-Thread Online Packages (STM32F407 RT-Spark)	6m 36s
RTduino/Arduino Libraries (STM32F412 Nucleo)	11m 20s
RTduino/Arduino Libraries (Raspberry Pico)	11m 19s
others_at32_hc32_ht32	7m 16s
stm32l4_f0_f1	14m 33s
stm32_f2_f4	8m 53s
stm32_f7_g0_h7_mp15_u5_h5_wb5	6m 10s
nxp_renesas	5m 32s
nuvoton	4m 58s
gd32_n32_apm32	5m 15s
nordic_Infineon_TI_microchip	8m 58s
mips	2m 36s
aarch64	3m 52s
riscv-none	2m 56s
riscv64-unknown	6m 13s
hpmicro	2m 44s
llvm-arm	5m 28s
simulator	2m 55s
ESP32C3	27m 30s
i386-unknown	3m 38s
	2h 28m 42s

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