internal/cpu: don't define CacheLinePadSize for mips64x

For libgo the definition comes from the generated file cpugen.go.

Fixes https://gcc.gnu.org/PR98041

Change-Id: I355d09f88816821a7afff3c90a7c9e148edf10b3
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/273866
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
diff --git a/libgo/go/internal/cpu/cpu_mips64x.go b/libgo/go/internal/cpu/cpu_mips64x.go
index 0c4794a..af10a50 100644
--- a/libgo/go/internal/cpu/cpu_mips64x.go
+++ b/libgo/go/internal/cpu/cpu_mips64x.go
@@ -6,8 +6,6 @@
 
 package cpu
 
-const CacheLinePadSize = 32
-
 // This is initialized by archauxv and should not be changed after it is
 // initialized.
 var HWCap uint