message: Remove unused variable. NFC.
diff: @@ -770,7 +770,6 @@ typedef union {
  } TaggedDoubleBits;
  static uint64_t decodeExponent(uint64_t exp) {
  - int64_t exp7 = exp;
  // Tagged exponent field is 7-bit signed. Sign-extend the value to 64 bits
  // before performing arithmetic.
  return llvm::SignExtend64<7>(exp) + TAGGED_DATE_EXPONENT_BIAS;
  