cmd/link: need to handle new-style loong64 relocs #63725
Description
What version of Go are you using (go version)?
$ go version go version go1.21.3 linux/loong64
Does this issue reproduce with the latest release?
Yes (found during packaging testing)
What operating system and processor architecture are you using (go env)?
Debian Linux sid, Loongson 3A5000.
go env Output
$ go env
What did you do?
cd $GOROOT/src/cmd/link && go test ./...
What did you expect to see?
all tests pass
What did you see instead?
ok cmd/internal/src 0.013s
ok cmd/internal/test2json 0.779s
--- FAIL: TestMinusRSymsWithSameName (0.76s)
elf_test.go:164: gcc [-fPIC -mabi=lp64d -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build4287643683=/tmp/go-build -gno-record-gcc-switches] -c -o /tmp/TestMinusRSymsWithSameName5512364/001/x0.o /tmp/TestMinusRSymsWithSameName5512364/001/x0.c
elf_test.go:164: gcc [-fPIC -mabi=lp64d -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build4287643683=/tmp/go-build -gno-record-gcc-switches] -c -o /tmp/TestMinusRSymsWithSameName5512364/001/x1.o /tmp/TestMinusRSymsWithSameName5512364/001/x1.c
elf_test.go:172: gcc [-fPIC -mabi=lp64d -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build4287643683=/tmp/go-build -gno-record-gcc-switches] -nostdlib -r -o /tmp/TestMinusRSymsWithSameName5512364/001/ldr.syso [/tmp/TestMinusRSymsWithSameName5512364/001/x0.o /tmp/TestMinusRSymsWithSameName5512364/001/x1.o]
elf_test.go:192: /root/debian-upstream/golang-1.21-1.21.3/bin/go build
elf_test.go:197: # elf_test
/tmp/go-build2943499130/b001/_pkg_.a(ldr.syso): unknown relocation type 66; compiled without -fpic?
elf_test.go:198: exit status 1
FAIL
FAIL cmd/link 13.001s
ok cmd/link/internal/benchmark 0.023s