Fix Windows build.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1065 matching lines @@
     ASSERT(ToRegister(instr->result()).is(edx));
     Register scratch = ToRegister(instr->TempAt(0));
 
     // Find b which: 2^b < divisor_abs < 2^(b+1).
     unsigned b = 31 - CompilerIntrinsics::CountLeadingZeros(divisor_abs);
     unsigned shift = 32 + b;  // Precision +1bit (effectively).
     double multiplier_f =
         static_cast<double>(static_cast<uint64_t>(1) << shift) / divisor_abs;
     int64_t multiplier;
     if (multiplier_f - floor(multiplier_f) < 0.5) {
-        multiplier = floor(multiplier_f);
+        multiplier = static_cast<int64_t>(floor(multiplier_f));
     } else {
-        multiplier = floor(multiplier_f) + 1;
+        multiplier = static_cast<int64_t>(floor(multiplier_f)) + 1;
     }
     // The multiplier is a uint32.
     ASSERT(multiplier > 0 &&
            multiplier < (static_cast<int64_t>(1) << 32));
     __ mov(scratch, dividend);
     if (divisor < 0 &&
         instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
       __ test(dividend, dividend);
       DeoptimizeIf(zero, instr->environment());
     }
-    __ mov(edx, multiplier);
+    __ mov(edx, static_cast<int32_t>(multiplier));
     __ imul(edx);
     if (static_cast<int32_t>(multiplier) < 0) {
       __ add(edx, scratch);
     }
     Register reg_lo = eax;
     Register reg_byte_scratch = scratch;
     if (!reg_byte_scratch.is_byte_register()) {
         __ xchg(reg_lo, reg_byte_scratch);
         reg_lo = scratch;
         reg_byte_scratch = eax;
@@ skipping 4222 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32