Reorganize tests/ui/issues/ - 02

[ujjwalvishwakarma2006]

old-name	new-sub-dir	new-name
issue-19001.rs issue	recursion/	recursive-struct-with-raw-pointer-field.rs
issue-31769.rs issue	attributes/	dont-allow-inline-and-repr-at-invalid-positions.rs
issue-31769.stderr	attributes/	dont-allow-inline-and-repr-at-invalid-positions.stderr
issue-33202.rs issue	attributes/	repr-on-single-variant-Enum.rs
issue-38763.rs issue	foreign/	foreign-fn-with-more-than-8-byte-arg-size.rs

r? Kivooeo

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