MIPS: Optimise Math.floor(x/y) to use integer division for MIPS.

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index a8d7e0436fcfe384ca6919b230bd2c1bd6ba82d5..1c99cf99f1b685ae6d191c244bce18c46da9287f 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -384,6 +384,17 @@ class LCodeGen BASE_EMBEDDED {
                     Register source,
                     int* offset,
                     AllocationSiteMode mode);
+  // Emit optimized code for integer division.
+  // Inputs are signed.
+  // All registers are clobbered.
+  // If 'remainder' is no_reg, it is not computed.
+  void EmitSignedIntegerDivisionByConstant(Register result,
+                                           Register dividend,
+                                           int32_t divisor,
+                                           Register remainder,
+                                           Register scratch,
+                                           LEnvironment* environment);
+
 
   void EnsureSpaceForLazyDeopt();
   void DoLoadKeyedExternalArray(LLoadKeyed* instr);