Eliminates more large immediates from x64 code.

runtime/vm/intrinsifier_x64.cc

Index: runtime/vm/intrinsifier_x64.cc
===================================================================
--- runtime/vm/intrinsifier_x64.cc	(revision 28057)
+++ runtime/vm/intrinsifier_x64.cc	(working copy)
@@ -1101,7 +1101,8 @@
   __ TryAllocate(double_class,
                  &fall_through,
                  Assembler::kNearJump,
-                 RAX);  // Result register.
+                 RAX,  // Result register.
+                 kNoRegister);  // Pool pointer might not be loaded.
   __ movsd(FieldAddress(RAX, Double::value_offset()), XMM0);
   __ ret();
   __ Bind(&fall_through);
@@ -1145,7 +1146,8 @@
   __ TryAllocate(double_class,
                  &fall_through,
                  Assembler::kNearJump,
-                 RAX);  // Result register.
+                 RAX,  // Result register.
+                 kNoRegister);  // Pool pointer might not be loaded.
   __ movsd(FieldAddress(RAX, Double::value_offset()), XMM0);
   __ ret();
   __ Bind(&fall_through);
@@ -1166,7 +1168,8 @@
   __ TryAllocate(double_class,
                  &fall_through,
                  Assembler::kNearJump,
-                 RAX);  // Result register.
+                 RAX,  // Result register.
+                 kNoRegister);  // Pool pointer might not be loaded.
   __ movsd(FieldAddress(RAX, Double::value_offset()), XMM0);
   __ ret();
   __ Bind(&fall_through);
@@ -1236,7 +1239,8 @@
   __ TryAllocate(double_class,
                  &alloc_failed,
                  Assembler::kNearJump,
-                 RAX);  // Result register.
+                 RAX,  // Result register.
+                 kNoRegister);  // Pool pointer might not be loaded.
   __ fstpl(FieldAddress(RAX, Double::value_offset()));
   __ ret();
 
@@ -1283,7 +1287,8 @@
   __ TryAllocate(double_class,
                  &fall_through,
                  Assembler::kNearJump,
-                 RAX);  // Result register.
+                 RAX,  // Result register.
+                 kNoRegister);  // Pool pointer might not be loaded.
   __ movsd(FieldAddress(RAX, Double::value_offset()), XMM0);
   __ ret();
   __ Bind(&is_smi);