X64: Change strategy for spilling to match ia32. It's just better.

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 5a360e8e69dea900ee64e59425dfcd779ddc1f54..e665385c69be6e667b6d58212bdbbc58657ef159 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -382,6 +382,11 @@ void Assembler::Align(int m) {
 }
 
 
+void Assembler::CodeTargetAlign() {
+  Align(16);  // Preferred alignment of jump targets on x64.
+}
+
+
 void Assembler::bind_to(Label* L, int pos) {
   ASSERT(!L->is_bound());  // Label may only be bound once.
   last_pc_ = NULL;