[mlir][CAPI][test] Change casts and fprintf format strings from long to intptr_t

[zero9178]

Summary

A test in ir.c makes use of casting a void* to an integer type to print it's address. This cast is currently done with the datatype long however, which is only guaranteed to be equal to the pointer width on LP64 system. Other platforms may use a length not equal to the pointer width. 64bit Windows as an example uses 32 bit for long which does not match the 64 bit pointers.
This also results in clang warning due to -Wvoid-pointer-to-int-cast.

Technically speaking, since the test only passes the value 42, it does not cause any issues, but it'd be nice to fix the warning at least.

[stellaraccident]

Thank you for the fix!

mlir/test/CAPI/ir.c

 #include "mlir-c/BuiltinAttributes.h"
 #include "mlir-c/BuiltinTypes.h"
 #include "mlir-c/Diagnostics.h"
 #include "mlir-c/Dialect/Standard.h"
 #include "mlir-c/IntegerSet.h"
 #include "mlir-c/Registration.h"
 
 #include <assert.h>
+#include <inttypes.h>
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 void populateLoopBody(MlirContext ctx, MlirBlock loopBody,
                       MlirLocation location, MlirBlock funcBody) {
   MlirValue iv = mlirBlockGetArgument(loopBody, 0);
int testOperands() {
   MlirOperationState opState =
       mlirOperationStateGet(mlirStringRefCreateFromCString("dummy.op"), loc);
   MlirValue initialOperands[] = {constZeroValue};
   mlirOperationStateAddOperands(&opState, 1, initialOperands);
   MlirOperation op = mlirOperationCreate(&opState);
 
   // Test operand APIs.
   intptr_t numOperands = mlirOperationGetNumOperands(op);
-  fprintf(stderr, "Num Operands: %ld\n", numOperands);
+  fprintf(stderr, "Num Operands: %" PRIdPTR "\n", numOperands);
   // CHECK: Num Operands: 1
 
   MlirValue opOperand = mlirOperationGetOperand(op, 0);
   fprintf(stderr, "Original operand: ");
   mlirValuePrint(opOperand, printToStderr, NULL);
   // CHECK: Original operand: {{.+}} {value = 0 : index}
 
   mlirOperationSetOperand(op, 0, constOneValue);
int testClone() {
   // CHECK: %0 = "std.constant"() {value = 0 : index} : () -> index
   // CHECK: %0 = "std.constant"() {value = 1 : index} : () -> index
 
   return 0;
 }
 
 // Wraps a diagnostic into additional text we can match against.
 MlirLogicalResult errorHandler(MlirDiagnostic diagnostic, void *userData) {
-  fprintf(stderr, "processing diagnostic (userData: %ld) <<\n", (long)userData);
+  fprintf(stderr, "processing diagnostic (userData: %" PRIdPTR ") <<\n",
+          (intptr_t)userData);
   mlirDiagnosticPrint(diagnostic, printToStderr, NULL);
   fprintf(stderr, "\n");
   MlirLocation loc = mlirDiagnosticGetLocation(diagnostic);
   mlirLocationPrint(loc, printToStderr, NULL);
   assert(mlirDiagnosticGetNumNotes(diagnostic) == 0);
-  fprintf(stderr, "\n>> end of diagnostic (userData: %ld)\n", (long)userData);
+  fprintf(stderr, "\n>> end of diagnostic (userData: %" PRIdPTR ")\n",
+          (intptr_t)userData);
   return mlirLogicalResultSuccess();
 }
 
 // Logs when the delete user data callback is called
 static void deleteUserData(void *userData) {
-  fprintf(stderr, "deleting user data (userData: %ld)\n", (long)userData);
+  fprintf(stderr, "deleting user data (userData: %" PRIdPTR ")\n",
+          (intptr_t)userData);
 }
 
 void testDiagnostics() {
   MlirContext ctx = mlirContextCreate();
   MlirDiagnosticHandlerID id = mlirContextAttachDiagnosticHandler(
       ctx, errorHandler, (void *)42, deleteUserData);
   fprintf(stderr, "@test_diagnostics\n");
   MlirLocation unknownLoc = mlirLocationUnknownGet(ctx);