Use VLDR instead of VMOVs from GPR when a 64-bit double can't be encoded as a VMOV immediate.

src/arm/constants-arm.h

 // Copyright 2011 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 240 matching lines @@
   B27 = 1 << 27,
   B28 = 1 << 28,
 
   // Instruction bit masks.
   kCondMask   = 15 << 28,
   kALUMask    = 0x6f << 21,
   kRdMask     = 15 << 12,  // In str instruction.
   kCoprocessorMask = 15 << 8,
   kOpCodeMask = 15 << 21,  // In data-processing instructions.
   kImm24Mask  = (1 << 24) - 1,
-  kOff12Mask  = (1 << 12) - 1
+  kOff12Mask  = (1 << 12) - 1,
+  kOff8Mask  = (1 << 8) - 1
 };
 
 
 // -----------------------------------------------------------------------------
 // Addressing modes and instruction variants.
 
 // Condition code updating mode.
 enum SBit {
   SetCC   = 1 << 20,  // Set condition code.
   LeaveCC = 0 << 20   // Leave condition code unchanged.
@@ skipping 176 matching lines @@
 
 // ldr(r, MemOperand(sp, 4, PostIndex), al) instruction (aka pop(r))
 // register r is not encoded.
 extern const Instr kPopRegPattern;
 
 // mov lr, pc
 extern const Instr kMovLrPc;
 // ldr rd, [pc, #offset]
 extern const Instr kLdrPCMask;
 extern const Instr kLdrPCPattern;
+// vldr dd, [pc, #offset]
+extern const Instr kVldrDPCMask;
+extern const Instr kVldrDPCPattern;
 // blxcc rm
 extern const Instr kBlxRegMask;
 
 extern const Instr kBlxRegPattern;
 
 extern const Instr kMovMvnMask;
 extern const Instr kMovMvnPattern;
 extern const Instr kMovMvnFlip;
 extern const Instr kMovLeaveCCMask;
 extern const Instr kMovLeaveCCPattern;
@@ skipping 297 matching lines @@
   static int Number(const char* name, bool* is_double);
 
  private:
   static const char* names_[kNumVFPRegisters];
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_