[X86][NFC] Remove unused feature UseAA

llvm/lib/Target/X86/X86.td

@@ -582,10 +582,6 @@ def TuningUseGLMDivSqrtCosts
     : SubtargetFeature<"use-glm-div-sqrt-costs", "UseGLMDivSqrtCosts", "true",
         "Use Goldmont specific floating point div/sqrt costs">;
 
-// Enable use of alias analysis during code generation.
-def FeatureUseAA : SubtargetFeature<"use-aa", "UseAA", "true",
-                                    "Use alias analysis during codegen">;
-
 //===----------------------------------------------------------------------===//
 // X86 CPU Families
 // TODO: Remove these - use general tuning features to determine codegen.

llvm/lib/Target/X86/X86Subtarget.h

@@ -842,7 +842,6 @@ public:
   /// TODO: to be removed later and replaced with suitable properties
   bool isAtom() const { return IsAtom; }
   bool useSoftFloat() const { return UseSoftFloat; }
-  bool useAA() const override { return UseAA; }
 
   /// Use mfence if we have SSE2 or we're on x86-64 (even if we asked for
   /// no-sse2). There isn't any reason to disable it if the target processor