[IR] Add ICmpInst::isCommutative and FCmpInst::isCommutative static wrappers (#116398)

Add static variants that can used with the Predicate enum directly.

Author: RKSimon

llvm/include/llvm/IR/Instructions.h

@@ -1248,9 +1248,13 @@ class ICmpInst: public CmpInst {
     return isEquality(getPredicate());
   }
 
+  /// @returns true if the predicate is commutative
+  /// Determine if this relation is commutative.
+  static bool isCommutative(Predicate P) { return isEquality(P); }
+
   /// @returns true if the predicate of this ICmpInst is commutative
   /// Determine if this relation is commutative.
-  bool isCommutative() const { return isEquality(); }
+  bool isCommutative() const { return isCommutative(getPredicate()); }
 
   /// Return true if the predicate is relational (not EQ or NE).
   ///
@@ -1369,7 +1373,7 @@ class FCmpInst: public CmpInst {
     AssertOK();
   }
 
-  /// @returns true if the predicate of this instruction is EQ or NE.
+  /// @returns true if the predicate is EQ or NE.
   /// Determine if this is an equality predicate.
   static bool isEquality(Predicate Pred) {
     return Pred == FCMP_OEQ || Pred == FCMP_ONE || Pred == FCMP_UEQ ||
@@ -1380,16 +1384,17 @@ class FCmpInst: public CmpInst {
   /// Determine if this is an equality predicate.
   bool isEquality() const { return isEquality(getPredicate()); }
 
-  /// @returns true if the predicate of this instruction is commutative.
+  /// @returns true if the predicate is commutative.
   /// Determine if this is a commutative predicate.
-  bool isCommutative() const {
-    return isEquality() ||
-           getPredicate() == FCMP_FALSE ||
-           getPredicate() == FCMP_TRUE ||
-           getPredicate() == FCMP_ORD ||
-           getPredicate() == FCMP_UNO;
+  static bool isCommutative(Predicate Pred) {
+    return isEquality(Pred) || Pred == FCMP_FALSE || Pred == FCMP_TRUE ||
+           Pred == FCMP_ORD || Pred == FCMP_UNO;
   }
 
+  /// @returns true if the predicate of this instruction is commutative.
+  /// Determine if this is a commutative predicate.
+  bool isCommutative() const { return isCommutative(getPredicate()); }
+
   /// @returns true if the predicate is relational (not EQ or NE).
   /// Determine if this a relational predicate.
   bool isRelational() const { return !isEquality(); }