Add Float64x2, Float64x2List, etc... with runtime and dart2js implementations

runtime/platform/globals.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef PLATFORM_GLOBALS_H_
 #define PLATFORM_GLOBALS_H_
 
 // __STDC_FORMAT_MACROS has to be defined before including <inttypes.h> to
 // enable platform independent printf format specifiers.
 #ifndef __STDC_FORMAT_MACROS
@@ skipping 58 matching lines @@
 #elif defined(_WIN32)
 #define TARGET_OS_WINDOWS 1
 #else
 #error Automatic target os detection failed.
 #endif
 
 struct simd128_value_t {
   union {
     float float_storage[4];
     int32_t int_storage[4];
+    double double_storage[2];
   };
   simd128_value_t& readFrom(const float* v) {
     float_storage[0] = v[0];
     float_storage[1] = v[1];
     float_storage[2] = v[2];
     float_storage[3] = v[3];
     return *this;
   }
   simd128_value_t& readFrom(const int32_t* v) {
     int_storage[0] = v[0];
     int_storage[1] = v[1];
     int_storage[2] = v[2];
     int_storage[3] = v[3];
     return *this;
   }
+  simd128_value_t& readFrom(const double* v) {
+    double_storage[0] = v[0];
+    double_storage[1] = v[1];
+    return *this;
+  }
   simd128_value_t& readFrom(const simd128_value_t* v) {
     *this = *v;
     return *this;
   }
   void writeTo(float* v) {
     v[0] = float_storage[0];
     v[1] = float_storage[1];
     v[2] = float_storage[2];
     v[3] = float_storage[3];
   }
   void writeTo(int32_t* v) {
     v[0] = int_storage[0];
     v[1] = int_storage[1];
     v[2] = int_storage[2];
     v[3] = int_storage[3];
   }
+  void writeTo(double* v) {
+    v[0] = double_storage[0];
+    v[1] = double_storage[1];
+  }
   void writeTo(simd128_value_t* v) {
     *v = *this;
   }
 };
 
 // Processor architecture detection.  For more info on what's defined, see:
 //   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
 //   http://www.agner.org/optimize/calling_conventions.pdf
 //   or with gcc, run: "echo | gcc -E -dM -"
 #if defined(_M_X64) || defined(__x86_64__)
@@ skipping 370 matching lines @@
 // N.B.: As the GCC manual states, "[s]ince non-static C++ methods
 // have an implicit 'this' argument, the arguments of such methods
 // should be counted from two, not one."
 #define PRINTF_ATTRIBUTE(string_index, first_to_check) \
   __attribute__((__format__(__printf__, string_index, first_to_check)))
 #else
 #define PRINTF_ATTRIBUTE(string_index, first_to_check)
 #endif
 
 #endif  // PLATFORM_GLOBALS_H_