Reland "Handle non-power-of-2 divisors in division-like operations".

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 6b0573ca6eb443cbe4b47d35a71efffa90954793..dafa65d203e9f2f4d913e3bde423c5996b9dc3d7 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -855,6 +855,10 @@ class MacroAssembler: public Assembler {
   // Insert code to verify that the x87 stack has the specified depth (0-7)
   void VerifyX87StackDepth(uint32_t depth);
 
+  // Emit code for a flooring division by a constant. The dividend register is
+  // unchanged, the result is in edx, and eax gets clobbered.
+  void FlooringDiv(Register dividend, int32_t divisor);
+
   // ---------------------------------------------------------------------------
   // StatsCounter support