[AArch64] Removed the narrow load merging code in the ld/st optimizer.

This feature has been disabled for some time now, so remove cruft.

Differential Revision: https://reviews.llvm.org/D26248

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286110 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Chad Rosier

lib/Target/AArch64/AArch64.td

@@ -61,9 +61,10 @@ def FeatureReserveX18 : SubtargetFeature<"reserve-x18", "ReserveX18", "true",
                                          "Reserve X18, making it unavailable "
                                          "as a GPR">;
 
-def FeatureMergeNarrowLd : SubtargetFeature<"merge-narrow-ld",
-                                            "MergeNarrowLoads", "true",
-                                            "Merge narrow load instructions">;
+def FeatureMergeNarrowZeroSt : SubtargetFeature<"merge-narrow-zero-st",
+                                                "MergeNarrowZeroStores", "true",
+                                                "Merge narrow zero store "
+                                                "instructions">;
 
 def FeatureUseAA : SubtargetFeature<"use-aa", "UseAA", "true",
                                     "Use alias analysis during codegen">;
@@ -181,7 +182,7 @@ def ProcA57     : SubtargetFeature<"a57", "ARMProcFamily", "CortexA57",
                                    FeatureCrypto,
                                    FeatureCustomCheapAsMoveHandling,
                                    FeatureFPARMv8,
-                                   FeatureMergeNarrowLd,
+                                   FeatureMergeNarrowZeroSt,
                                    FeatureNEON,
                                    FeaturePerfMon,
                                    FeaturePostRAScheduler,
@@ -252,7 +253,7 @@ def ProcKryo    : SubtargetFeature<"kryo", "ARMProcFamily", "Kryo",
                                    FeatureCrypto,
                                    FeatureCustomCheapAsMoveHandling,
                                    FeatureFPARMv8,
-                                   FeatureMergeNarrowLd,
+                                   FeatureMergeNarrowZeroSt,
                                    FeatureNEON,
                                    FeaturePerfMon,
                                    FeaturePostRAScheduler,