cmd/link/internal/riscv64: generate local text symbols for R_RISCV_CALL

Correctly generate local text symbols needed for R_RISCV_CALL when
external linking. R_RISCV_CALL was added in CL #520095 as a way of
marking AUIPC+JALR pairs, instead of overloading R_RISCV_PCREL_ITYPE.
However, genSymsLate was not updated to generate local text symbols
for the new relocation type, leading to HI20 symbol lookup failures.

This issue is detected by cmd/internal/obj/riscv.TestLargeCall,
however this is unfortunately skipped in short mode.

Fixes #65646

Change-Id: I8ee0f13791e0628f31657bf7dae2be8482b689b5
Reviewed-on: https://go-review.googlesource.com/c/go/+/567375
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

src/cmd/link/internal/riscv64/asm.go

@@ -170,8 +170,8 @@ func genSymsLate(ctxt *ld.Link, ldr *loader.Loader) {
 		relocs := ldr.Relocs(s)
 		for ri := 0; ri < relocs.Count(); ri++ {
 			r := relocs.At(ri)
-			if r.Type() != objabi.R_RISCV_PCREL_ITYPE && r.Type() != objabi.R_RISCV_PCREL_STYPE &&
-				r.Type() != objabi.R_RISCV_TLS_IE {
+			if r.Type() != objabi.R_RISCV_CALL && r.Type() != objabi.R_RISCV_PCREL_ITYPE &&
+				r.Type() != objabi.R_RISCV_PCREL_STYPE && r.Type() != objabi.R_RISCV_TLS_IE {
 				continue
 			}
 			if r.Off() == 0 && ldr.SymType(s) == sym.STEXT {