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1、HotSpot编译目标和级别
product：产品级别
fastdebug：快速调试级别
debug：调试级别
optimized：优化级别
COMMON_VM_PRODUCT_TARGETS=product product1 docs export_product
COMMON_VM_FASTDEBUG_TARGETS=fastdebug fastdebug1 docs export_fastdebug
COMMON_VM_DEBUG_TARGETS=debug debug1 docs export_debug
COMMON_VM_OPTIMIZED_TARGETS=optimized optimized1 docs export_optimized