fix(goobj): external package and symbol indices and arm64 pair relocations

Assisted-by: GLM 5.3

asm/goobj.go

@@ -68,11 +68,12 @@ const (
 	kindSDWARFLINES = 20
 )
 
-// Symbol flags (cmd/internal/goobj).
+// Symbol flags (cmd/internal/goobj).  The linkname flag is set only for
+// //go:linkname symbols (and main.main); ordinary assembly symbols carry
+// none, matching cmd/asm's output.
 const (
 	symFlagDupok   = 0x01
 	symFlagNoSplit = 0x10
-	symFlag2Link   = 0x10 // asm objects flag every named symbol as linkname
 	symABIStatic   = 0xffff
 )
 
@@ -287,7 +288,7 @@ func (img *Image) emitGOObject(pkgPath, srcPath string, pre []byte, minLC int, r
 			}
 		}
 		nps = append(nps, npSym{
-			sym:  goSym{name: name, abi: abi, typ: kindSTEXT, flag: flag, flag2: symFlag2Link, size: uint32(fn.Size)},
+			sym:  goSym{name: name, abi: abi, typ: kindSTEXT, flag: flag, size: uint32(fn.Size)},
 			data: code,
 		})
 	}
@@ -317,7 +318,7 @@ func (img *Image) emitGOObject(pkgPath, srcPath string, pre []byte, minLC int, r
 			abi = symABIStatic
 		}
 		defIdx[d.Name] = len(defs)
-		defs = append(defs, goSym{name: name, abi: abi, typ: typ, flag: flag, flag2: symFlag2Link, size: uint32(d.Size)})
+		defs = append(defs, goSym{name: name, abi: abi, typ: typ, flag: flag, size: uint32(d.Size)})
 		defData = append(defData, img.Data[d.Offset:d.Offset+d.Size])
 	}
 	fnFiIdx := make([]int, len(img.Funcs))