Rename the 'concept' variable in SymbolInterfaces.td

[lxsameer]

Summary

concept is a reserved keyword in C++20 and since we're using it as a variable name in mlir/include/mlir/IR/SymbolInterfaces.td it breaks the compilation under C++20.
here is an example of the failure (from a project of mine):

FAILED: src/CMakeFiles/lserene.dir/sir/sir.cpp.o 
/usr/bin/cmake -E __run_co_compile --tidy="clang-tidy;--extra-arg-before=--driver-mode=g++" --source=../src/sir/sir.cpp -- /home/lxsameer/usr/lib/llvm-13/bin/clang++ -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/lxsameer/usr/lib/llvm-13/include -I../include -Iinclude -I. -I_deps/fmtlib-src/include -Wall -Wextra -Werror -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wstring-conversion -fdiagnostics-color -g -g -fno-omit-frame-pointer -fsanitize=address   -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -D_DEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -fno-rtti -std=c++20 -MD -MT src/CMakeFiles/lserene.dir/sir/sir.cpp.o -MF src/CMakeFiles/lserene.dir/sir/sir.cpp.o.d -o src/CMakeFiles/lserene.dir/sir/sir.cpp.o -c ../src/sir/sir.cpp
/home/lxsameer/usr/lib/llvm-13/include/mlir/IR/SymbolInterfaces.h.inc:155:13: error: expected unqualified-id [clang-diagnostic-error]
      auto *concept = getInterfaceFor(op);
            ^
/home/lxsameer/usr/lib/llvm-13/include/mlir/IR/SymbolInterfaces.h.inc:156:12: error: expected expression [clang-diagnostic-error]
      if (!concept)
           ^
/home/lxsameer/usr/lib/llvm-13/include/mlir/IR/SymbolInterfaces.h.inc:158:15: error: expected expression [clang-diagnostic-error]
      return !concept->isOptionalSymbol(op) ||
              ^
6 warnings and 3 errors generated.

[mehdi_amini]

Thanks!

[lxsameer]

@mehdi_amini Since I don't have commit access, would you do me the honor of merging this one please ?
for the commit info, name: Sameer Rahmani email: [e-mail]

thanks

mlir/include/mlir/IR/SymbolInterfaces.td

if (concreteOp.isDeclaration() && concreteOp.isPublic())
       return concreteOp.emitOpError("symbol declaration cannot have public "
              "visibility");
     return success();
   }];
 
   let extraClassDeclaration = [{
     /// Custom classof that handles the case where the symbol is optional.
     static bool classof(Operation *op) {
-      auto *concept = getInterfaceFor(op);
-      if (!concept)
+      auto *opConcept = getInterfaceFor(op);
+      if (!opConcept)
         return false;
-      return !concept->isOptionalSymbol(concept, op) ||
+      return !opConcept->isOptionalSymbol(opConcept, op) ||
              op->getAttr(::mlir::SymbolTable::getSymbolAttrName());
     }
   }];
 
   let extraTraitClassDeclaration = [{
     using Visibility = mlir::SymbolTable::Visibility;
   }];
 }