[clang-tidy] Check request: llvm-no-parentheses-for-single-stmt-if

[denzor200]

before:

  if (RHS) {
    RHSOpcode = RHS->getOpcode();
  }

after:

  if (RHS)
    RHSOpcode = RHS->getOpcode();

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: Denis Mikhailov (denzor200)

before: ``` if (RHS) { RHSOpcode = RHS->getOpcode(); } ```

after:

  if (RHS)
    RHSOpcode = RHS->getOpcode();

[EugeneZelenko]

Should be option in https://clang.llvm.org/extra/clang-tidy/checks/readability/braces-around-statements.html.