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

runtime/vm/snapshot.h

Index: runtime/vm/snapshot.h
diff --git a/runtime/vm/snapshot.h b/runtime/vm/snapshot.h
index cc001386de17e0406f05ed231e374f2e2c67c3ed..9aa5bc39c5a8893e981e929b827126941c433c17 100644
--- a/runtime/vm/snapshot.h
+++ b/runtime/vm/snapshot.h
@@ -45,6 +45,7 @@ class RawRedirectionData;
 class RawFunction;
 class RawGrowableObjectArray;
 class RawFloat32x4;
+class RawFloat64x2;
 class RawInt32x4;
 class RawImmutableArray;
 class RawLanguageError;
@@ -275,6 +276,7 @@ class SnapshotReader : public BaseReader {
   RawGrowableObjectArray* NewGrowableObjectArray();
   RawFloat32x4* NewFloat32x4(float v0, float v1, float v2, float v3);
   RawInt32x4* NewInt32x4(uint32_t v0, uint32_t v1, uint32_t v2, uint32_t v3);
+  RawFloat64x2* NewFloat64x2(double v0, double v1);
   RawApiError* NewApiError();
   RawLanguageError* NewLanguageError();
   RawObject* NewInteger(int64_t value);