[SPARC] Mark Niagara3 as VIS3-capable

From SPARC T3 Supplement to the UltraSPARC Architecture 2007 Specification:
> T3 SPARC core has a new 9 stage floating point pipeline and added Fused
> Multiply-Add (FMADD) instruction and VIS 3.0 Instructions compared to
> UltraSPARC T2/T2+.

Reviewers: rorth, s-barannikov, brad0

Reviewed By: s-barannikov

Pull Request: llvm#138399

Author: koachan

llvm/lib/Target/Sparc/Sparc.td

@@ -156,7 +156,7 @@ def : Proc<"niagara",         [FeatureV9, FeatureV8Deprecated, FeatureVIS,
 def : Proc<"niagara2",        [FeatureV9, FeatureV8Deprecated, UsePopc,
                                FeatureVIS, FeatureVIS2]>;
 def : Proc<"niagara3",        [FeatureV9, FeatureV8Deprecated, UsePopc,
-                               FeatureVIS, FeatureVIS2]>;
+                               FeatureVIS, FeatureVIS2, FeatureVIS3]>;
 def : Proc<"niagara4",        [FeatureV9, FeatureV8Deprecated, UsePopc,
                                FeatureVIS, FeatureVIS2, FeatureVIS3]>;