Added test for Affine For loop with If (SCF)

#include "gtest/gtest.h"

#include "qcor_mlir_api.hpp"

#include "gtest/gtest.h"

namespace {

// returns count of non-overlapping occurrences of 'sub' in 'str'

int countSubstring(const std::string &str, const std::string &sub) {

  if (sub.length() == 0)

    return 0;

  int count = 0;

  for (size_t offset = str.find(sub); offset != std::string::npos;

       offset = str.find(sub, offset + sub.length())) {

    ++count;

  }

  return count;

}

} // namespace

// Check Affine-SCF constructs

TEST(qasm3VisitorTester, checkCFG_AffineScf) {

  const std::string qasm_code = R"#(OPENQASM 3;

include "qelib1.inc";

int[64] iterate_value = 0;

int[64] value_5 = 0;

int[64] value_2 = 0;

for i in [0:10] {

    iterate_value = i;

    if (i == 5) {

        print("Iterate over 5");

        value_5 = 5;

    }

    if (i == 2) {

        print("Iterate over 2");

        value_2 = 2;

    }

    print("i = ", i);

}

QCOR_EXPECT_TRUE(iterate_value == 9);

QCOR_EXPECT_TRUE(value_5 == 5);

QCOR_EXPECT_TRUE(value_2 == 2);

print("made it out of the loop");

)#";

  auto mlir = qcor::mlir_compile(qasm_code, "affine_scf",

                                 qcor::OutputType::MLIR, false);

  std::cout << mlir << "\n";

  // 1 for loop, 2 if blocks

  EXPECT_EQ(countSubstring(mlir, "affine.for"), 1);

  EXPECT_EQ(countSubstring(mlir, "scf.if"), 2);

  EXPECT_FALSE(qcor::execute(qasm_code, "affine_scf"));

}

TEST(qasm3VisitorTester, checkCtrlDirectives) {

  const std::string uint_index = R"#(OPENQASM 3;

            [&](mlir::Value loop_var) {

              // Create a new scope for the for loop

              symbol_table.enter_new_scope();

              symbol_table.add_symbol(idx_var_name, loop_var, {}, true);

              auto loop_var_cast = builder.create<mlir::IndexCastOp>(

                  location, builder.getI64Type(), loop_var);

              symbol_table.add_symbol(idx_var_name, loop_var_cast, {}, true);

              visitChildren(program_block);

              symbol_table.exit_scope();

            },