message: [NFC] Fix compiler warning in TestArmv7Disassembly.cpp
  The warning is
  comparison of integers of different signs: 'const int' and 'const unsigned long'
  and triggered by
  EXPECT_EQ (num_of_instructions, inst_list.GetSize());
  as num_of_instructions is an int in this comparison (and the RHS is size_t).
diff: @@ -48,7 +48,7 @@ void TestArmv7Disassembly::TearDownTestCase() {
  TEST_F(TestArmv7Disassembly, TestCortexFPDisass) {
  ArchSpec arch("armv7em--");
  - const int num_of_instructions = 3;
  + const unsigned num_of_instructions = 3;
  uint8_t data[] = {
  0x00, 0xee, 0x10, 0x2a, // 0xee002a10 : vmov s0, r2
  0xb8, 0xee, 0xc0, 0x0b, // 0xeeb80bc0 : vcvt.f64.s32 d0, s0
  