Revert "[flang] Lower c_ptr_eq/ne for iso_c_binding" (#85293)

Reverts #85135

There is an issue with module file generation in flang build.

Author: clementval

flang/include/flang/Optimizer/Builder/IntrinsicCall.h

@@ -208,9 +208,6 @@ struct IntrinsicLibrary {
   void genCFProcPointer(llvm::ArrayRef<fir::ExtendedValue>);
   fir::ExtendedValue genCFunLoc(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
   fir::ExtendedValue genCLoc(mlir::Type, llvm::ArrayRef<fir::ExtendedValue>);
-  template <mlir::arith::CmpIPredicate pred>
-  fir::ExtendedValue genCPtrCompare(mlir::Type,
-                                    llvm::ArrayRef<fir::ExtendedValue>);
   mlir::Value genCosd(mlir::Type, llvm::ArrayRef<mlir::Value>);
   void genDateAndTime(llvm::ArrayRef<fir::ExtendedValue>);
   mlir::Value genDim(mlir::Type, llvm::ArrayRef<mlir::Value>);

flang/lib/Optimizer/Builder/IntrinsicCall.cpp

@@ -177,8 +177,6 @@ static constexpr IntrinsicHandler handlers[]{
      /*isElemental=*/false},
     {"c_funloc", &I::genCFunLoc, {{{"x", asBox}}}, /*isElemental=*/false},
     {"c_loc", &I::genCLoc, {{{"x", asBox}}}, /*isElemental=*/false},
-    {"c_ptr_eq", &I::genCPtrCompare<mlir::arith::CmpIPredicate::eq>},
-    {"c_ptr_ne", &I::genCPtrCompare<mlir::arith::CmpIPredicate::ne>},
     {"ceiling", &I::genCeiling},
     {"char", &I::genChar},
     {"cmplx",
@@ -2799,23 +2797,6 @@ IntrinsicLibrary::genCLoc(mlir::Type resultType,
   return genCLocOrCFunLoc(builder, loc, resultType, args);
 }
 
-// C_PTR_EQ and C_PTR_NE
-template <mlir::arith::CmpIPredicate pred>
-fir::ExtendedValue
-IntrinsicLibrary::genCPtrCompare(mlir::Type resultType,
-                                 llvm::ArrayRef<fir::ExtendedValue> args) {
-  assert(args.size() == 2);
-  mlir::Value cPtr1 = fir::getBase(args[0]);
-  mlir::Value cPtrVal1 =
-      fir::factory::genCPtrOrCFunptrValue(builder, loc, cPtr1);
-  mlir::Value cPtr2 = fir::getBase(args[1]);
-  mlir::Value cPtrVal2 =
-      fir::factory::genCPtrOrCFunptrValue(builder, loc, cPtr2);
-  mlir::Value cmp =
-      builder.create<mlir::arith::CmpIOp>(loc, pred, cPtrVal1, cPtrVal2);
-  return builder.createConvert(loc, resultType, cmp);
-}
-
 // CEILING
 mlir::Value IntrinsicLibrary::genCeiling(mlir::Type resultType,
                                          llvm::ArrayRef<mlir::Value> args) {

flang/module/__fortran_builtins.f90

@@ -110,7 +110,7 @@
   public :: operator(==)
 
   interface operator(/=)
-    module procedure __builtin_c_ptr_ne
+    module procedure __builtin_c_ptr_eq
   end interface
   public :: operator(/=)