re PR go/89169 (FAIL: internal/cpu)

	PR go/89169
    internal/cpu: do not require POWER8
    
    Although the gc toolchain requires POWER8, the gccgo toolchain does not.
    
    Fixes https://gcc.gnu.org/PR89169
    
    Reviewed-on: https://go-review.googlesource.com/c/162979

From-SVN: r269019

gcc/go/gofrontend/MERGE

-672572130ba7a7b277a4c9c8f93576fc42accf63
+fe0382eabbf1e8b148dc8cb7733348bd9d887e10
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/internal/cpu/cpu_ppc64x.go

@@ -29,9 +29,7 @@ func doinit() {
 		{Name: "darn", Feature: &PPC64.HasDARN},
 		{Name: "scv", Feature: &PPC64.HasSCV},
 		{Name: "power9", Feature: &PPC64.IsPOWER9},
-
-		// These capabilities should always be enabled on ppc64 and ppc64le:
-		{Name: "power8", Feature: &PPC64.IsPOWER8, Required: true},
+		{Name: "power8", Feature: &PPC64.IsPOWER8},
 	}
 
 	// HWCAP2 feature bits