ARM: Add instruction VFPCompareAndSetFlags to macro assembler

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
===================================================================
--- src/arm/macro-assembler-arm.h	(revision 6244)
+++ src/arm/macro-assembler-arm.h	(working copy)
@@ -243,9 +243,36 @@
             const MemOperand& dst,
             Condition cond = al);
 
-  // Clear FPSCR bits.
-  void ClearFPSCRBits(uint32_t bits_to_clear, Register scratch);
+  // Clear specified FPSCR bits.
+  void ClearFPSCRBits(const uint32_t bits_to_clear,
+                      const Register scratch,
+                      const Condition cond = al);
 
+  // Compare double values and move the result to the normal condition flags.
+  // To include NaN check the scratch register is required. In that case the
+  // overflow bit will be set is any of the operands is a NaN indicating
+  // unordered result of the comparison. If no scratch register is supplied the
+  // value if the overflow bit is undefined.
+  void VFPCompareAndSetFlags(const DwVfpRegister src1,
+                             const DwVfpRegister src2,
+                             const Register scratch = no_reg,
+                             const Condition cond = al);
+  void VFPCompareAndSetFlags(const DwVfpRegister src1,
+                             const double src2,
+                             const Register scratch = no_reg,
+                             const Condition cond = al);
+
+  // Compare double values and then load the fpscr flags to a register.
+  void VFPCompareAndLoadFlags(const DwVfpRegister src1,
+                              const DwVfpRegister src2,
+                              const Register fpscr_flags,
+                              const Condition cond = al);
+  void VFPCompareAndLoadFlags(const DwVfpRegister src1,
+                              const double src2,
+                              const Register fpscr_flags,
+                              const Condition cond = al);
+
+
   // ---------------------------------------------------------------------------
   // Activation frames