[dev.ssa] cmd/compile: fix typo in log

Change-Id: Ic7be8fa3a89e46a93df181df3163ec1bf7e96a23
Reviewed-on: https://go-review.googlesource.com/14076Reviewed-by: Minux Ma <minux@golang.org>

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

@@ -434,7 +434,7 @@ func (s *regAllocState) allocValToReg(v *Value, mask regMask, nospill bool) *Val
 		// TODO: rematerialize if we can.
 		case vi.spill2 != nil:
 			if logSpills {
-				fmt.Println("regallog: load spill2")
+				fmt.Println("regalloc: load spill2")
 			}
 			c = s.curBlock.NewValue1(v.Line, OpLoadReg, v.Type, vi.spill2)
 			vi.spill2used = true