fix bugs in *ASMBackend bytecode version computation #1694

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tim-hoffman wants to merge 2 commits intosoot-oss:developfrom tim-hoffman:BUG_bytecode_version

+289-93

Commits on Jul 6, 2021

fix bugs in *ASMBackend bytecode version computation and add ASM validator and a test case for the 1.8 bug
tim-hoffman
committed

Commits on Jul 21, 2021

fix the test case Java11 failure
tim-hoffman
committed