cmd/link/internal/loadelf: remove useless relocation size information of loong64

As of CL 455017 we have switched to following the new style relocations on
loong64, these stack based relocations should be removed.

Change-Id: Ic129a5665cf6f183a32e13b6f1a55d712a99d721
Reviewed-on: https://go-review.googlesource.com/c/go/+/537335
Reviewed-by: sophie zhao <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
Auto-Submit: abner chenc <[email protected]>
Commit-Queue: abner chenc <[email protected]>
Reviewed-by: Qiqi Huang <[email protected]>
Reviewed-by: abner chenc <[email protected]>

Author: limeidan

src/cmd/link/internal/loadelf/ldelf.go

@@ -1026,11 +1026,7 @@ func relSize(arch *sys.Arch, pn string, elftype uint32) (uint8, uint8, error) {
 		LOONG64 | uint32(elf.R_LARCH_SUB16)<<16:
 		return 2, 2, nil
 
-	case LOONG64 | uint32(elf.R_LARCH_SOP_PUSH_PCREL)<<16,
-		LOONG64 | uint32(elf.R_LARCH_SOP_PUSH_GPREL)<<16,
-		LOONG64 | uint32(elf.R_LARCH_SOP_PUSH_ABSOLUTE)<<16,
-		LOONG64 | uint32(elf.R_LARCH_MARK_LA)<<16,
-		LOONG64 | uint32(elf.R_LARCH_SOP_POP_32_S_0_10_10_16_S2)<<16,
+	case LOONG64 | uint32(elf.R_LARCH_MARK_LA)<<16,
 		LOONG64 | uint32(elf.R_LARCH_MARK_PCREL)<<16,
 		LOONG64 | uint32(elf.R_LARCH_ADD24)<<16,
 		LOONG64 | uint32(elf.R_LARCH_ADD32)<<16,