LLVM/project 0ffe270lld/test/ELF allow-shlib-undefined.s why-extract.s, lld/test/ELF/linkerscript discard-section.s input-relative.s

[ELF,test] Remove unneeded -o /dev/null

When the script has executed `cd %t`, it is fine to to use the output
file `a.out`.
(We don't want to rely on lit's default PWD to support lit compatible
runners. Therefore -o /dev/null is used when PWD has not been changed
to a %t derived path.)
DeltaFile
+18-18lld/test/ELF/allow-shlib-undefined.s
+12-12lld/test/ELF/why-extract.s
+9-9lld/test/ELF/aarch64-feature-gcs.s
+9-9lld/test/ELF/arm-cmse-diagnostics.s
+8-8lld/test/ELF/lto/archive-mixed.test
+6-6lld/test/ELF/remap-inputs.test
+5-7lld/test/ELF/duplicated-synthetic-sym.s
+4-4lld/test/ELF/print-archive-stats.s
+4-4lld/test/ELF/riscv-attributes.s
+3-3lld/test/ELF/avr-reloc-error.s
+3-3lld/test/ELF/reproduce-lto.s
+2-2lld/test/ELF/lto/obj-path.ll
+2-2lld/test/ELF/linkerscript/discard-section.s
+2-2lld/test/ELF/non-abs-reloc.s
+2-2lld/test/ELF/linkerscript/input-relative.s
+1-1lld/test/ELF/allow-shlib-undefined-weak.s
+1-1lld/test/ELF/common-archive-lookup.s
+1-1lld/test/ELF/linkerscript/locationcountererr-arm-exidx.test
+1-1lld/test/ELF/lto/parallel.ll
+1-1lld/test/ELF/reproduce-deplibs.s
+1-1lld/test/ELF/unknown-section.test
+95-9721 files

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