Revert "[bigint] Implement Divide and Remainder"

This reverts commit 2f88c9b2.

Reason for revert: Specualtive, seems to break win clang compilation:
https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20clang/builds/8318

Original change's description:
> [bigint] Implement Divide and Remainder
> 
> Bug: v8:6791
> Change-Id: I5ab97feeb25da29bc76cd28088836b4f12d1d916
> Reviewed-on: https://chromium-review.googlesource.com/678037
> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48152}

TBR=jkummerow@chromium.org,jarin@chromium.org,littledan@chromium.org

Change-Id: I400beee84782d0ff7fa972e4188a6d2b6d39bb96
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6791
Reviewed-on: https://chromium-review.googlesource.com/684075Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48157}

src/base/bits.h

@@ -117,7 +117,6 @@ inline unsigned CountLeadingZeros64(uint64_t value) {
 #endif
 }
 
-DEFINE_32_64_OVERLOADS(CountLeadingZeros)
 
 // ReverseBits(value) returns |value| in reverse bit order.
 template <typename T>

src/messages.h

@@ -503,7 +503,6 @@ class ErrorUtils : public AllStatic {
   T(SuperAlreadyCalled, "Super constructor may only be called once")           \
   T(UnsupportedSuper, "Unsupported reference to 'super'")                      \
   /* RangeError */                                                             \
-  T(BigIntDivZero, "Division by zero")                                         \
   T(DateRange, "Provided date is not in valid range.")                         \
   T(ExpectedTimezoneID,                                                        \
     "Expected Area/Location(/Location)* for time zone, got %")                 \

src/objects/bigint.h

@@ -103,26 +103,6 @@ class BigInt : public HeapObject {
   static void MultiplyAccumulate(Handle<BigInt> multiplicand,
                                  digit_t multiplier, Handle<BigInt> accumulator,
                                  int accumulator_index);
-  static void InternalMultiplyAdd(BigInt* source, digit_t factor,
-                                  digit_t summand, int n, BigInt* result);
-
-  // Specialized helpers for Divide/Remainder.
-  static void AbsoluteDivSmall(Handle<BigInt> x, digit_t divisor,
-                               Handle<BigInt>* quotient, digit_t* remainder);
-  static void AbsoluteDivLarge(Handle<BigInt> dividend, Handle<BigInt> divisor,
-                               Handle<BigInt>* quotient,
-                               Handle<BigInt>* remainder);
-  static bool DoubleDigitGreaterThan(digit_t x_high, digit_t x_low,
-                                     digit_t y_high, digit_t y_low);
-  digit_t InplaceAdd(BigInt* summand, int start_index);
-  digit_t InplaceSub(BigInt* subtrahend, int start_index);
-  void InplaceRightShift(int shift);
-  enum SpecialLeftShiftMode {
-    kSameSizeResult,
-    kAlwaysAddOneDigit,
-  };
-  static Handle<BigInt> SpecialLeftShift(Handle<BigInt> x, int shift,
-                                         SpecialLeftShiftMode mode);
 
   static MaybeHandle<String> ToStringBasePowerOfTwo(Handle<BigInt> x,
                                                     int radix);
@@ -131,8 +111,6 @@ class BigInt : public HeapObject {
   static inline digit_t digit_add(digit_t a, digit_t b, digit_t* carry);
   static inline digit_t digit_sub(digit_t a, digit_t b, digit_t* borrow);
   static inline digit_t digit_mul(digit_t a, digit_t b, digit_t* high);
-  static inline digit_t digit_div(digit_t high, digit_t low, digit_t divisor,
-                                  digit_t* remainder);
 
   class LengthBits : public BitField<int, 0, kMaxLengthBits> {};
   class SignBits : public BitField<bool, LengthBits::kNext, 1> {};