Tweaked FlooringDiv back to TruncatingDiv again.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 6b84b0bc1aad2a8377890cc09140d7e0eec7fca9..fe65f9454232aa4c17ab9f936206a454d4b68d8f 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -4992,7 +4992,7 @@ void MacroAssembler::JumpIfDictionaryInPrototypeChain(
 }
 
 
-void MacroAssembler::FlooringDiv(Register dividend, int32_t divisor) {
+void MacroAssembler::TruncatingDiv(Register dividend, int32_t divisor) {
   ASSERT(!dividend.is(rax));
   ASSERT(!dividend.is(rdx));
   MultiplierAndShift ms(divisor);
@@ -5001,6 +5001,9 @@ void MacroAssembler::FlooringDiv(Register dividend, int32_t divisor) {
   if (divisor > 0 && ms.multiplier() < 0) addl(rdx, dividend);
   if (divisor < 0 && ms.multiplier() > 0) subl(rdx, dividend);
   if (ms.shift() > 0) sarl(rdx, Immediate(ms.shift()));
+  movl(rax, dividend);
+  shrl(rax, Immediate(31));
+  addl(rdx, rax);
 }