To improve consistency and avoid unneeded shell feature (output
redirection).
While here, make other changes to improve consistency
--docnum 1 => --docnum=1
-docnum=x => --docnum=x
Create COFF/, ELF/, and Minidump and move tests there.
Also
* Rename `*.test` to `*.yaml`
* For yaml2obj RUN lines, use `-o %t` instead of `> %t` for consistency.
We still have tests that check stdout is the default output, e.g.
multi-doc.test
* Update tests to consistently use `##` for comments.
`#` is for RUN and CHECK lines.
* Merge symboless-relocation.yaml and invalid-symboless-relocation.yaml to ELF/relocation-implicit-symbol-index.test
Reviewed By: grimar, jhenderson
Differential Revision: https://reviews.llvm.org/D70264
Fangrui Song