cmd/compile: remove issueSpill

Remove the useless issueSpill and continue directly.

Change-Id: I085e566be6f7200235e1bfe1f56a8e959316386a
GitHub-Last-Rev: 84db90c
GitHub-Pull-Request: #56520
Reviewed-on: https://go-review.googlesource.com/c/go/+/447195
Run-TryBot: Keith Randall <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>
Auto-Submit: Keith Randall <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Keith Randall <[email protected]>

Author: liu-xuewen

src/cmd/compile/internal/ssa/regalloc.go

@@ -1301,7 +1301,7 @@ func (s *regAllocState) regalloc(f *Func) {
 				}
 				b.Values = append(b.Values, v)
 				s.advanceUses(v)
-				goto issueSpill
+				continue
 			}
 			if v.Op == OpGetG && s.f.Config.hasGReg {
 				// use hardware g register
@@ -1311,7 +1311,7 @@ func (s *regAllocState) regalloc(f *Func) {
 				s.assignReg(s.GReg, v, v)
 				b.Values = append(b.Values, v)
 				s.advanceUses(v)
-				goto issueSpill
+				continue
 			}
 			if v.Op == OpArg {
 				// Args are "pre-spilled" values. We don't allocate
@@ -1669,8 +1669,6 @@ func (s *regAllocState) regalloc(f *Func) {
 				v.SetArg(i, a) // use register version of arguments
 			}
 			b.Values = append(b.Values, v)
-
-		issueSpill:
 		}
 
 		// Copy the control values - we need this so we can reduce the