cmd/compile: remove unused code in walk.Walk

no errors'll be added during ir.DumpList, no need to be check again

Change-Id: I85ae2edd4377851277e9bb2a8baa28825ac3fd90
GitHub-Last-Rev: b35ca85
GitHub-Pull-Request: #64955
Reviewed-on: https://go-review.googlesource.com/c/go/+/553895
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Keith Randall <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Matthew Dempsky <[email protected]>
Reviewed-by: Keith Randall <[email protected]>

Author: ezz-no

src/cmd/compile/internal/walk/walk.go

@@ -33,12 +33,6 @@ func Walk(fn *ir.Func) {
 		ir.DumpList(s, ir.CurFunc.Body)
 	}
 
-	lno := base.Pos
-
-	base.Pos = lno
-	if base.Errors() > errorsBefore {
-		return
-	}
 	walkStmtList(ir.CurFunc.Body)
 	if base.Flag.W != 0 {
 		s := fmt.Sprintf("after walk %v", ir.CurFunc.Sym())