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compile.c: avoid newarraykwsplat for arguments
`foo(*rest, post, **empty_kw)` is compiled like `foo(*rest + [post, **empty_kw])`, and `**empty_kw` is removed by "newarraykwsplat" instruction. However, the method call still has a flag of KW_SPLAT, so "post" is considered as a keyword hash, which caused a segfault. Note that the flag cannot be removed if "empty_kw" is not always empty. This change fixes the issue by compiling arguments with "newarray" instead of "newarraykwsplat". [Bug #16442]
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