X64 Crnakshaft: Added GeneratePrologue implementation.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 4a7b3aa3aeb06f9f10b905030c2b17928b96e774..1ee1f64e76a1a89b624af7c69b2637a5227ded33 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -305,15 +305,17 @@ void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
 
 
 int LChunk::GetNextSpillIndex(bool is_double) {
-  // Need to consider what index means: Is it 32 bit or 64 bit index?
-  UNIMPLEMENTED();
-  return 0;
+  return spill_slot_count_++;
 }
 
 
 LOperand* LChunk::GetNextSpillSlot(bool is_double)  {
-  UNIMPLEMENTED();
-  return NULL;
+  // All stack slots are Double stack slots on x64.
+  // Alternatively, at some point, start using half-size
+  // stack slots for int32 values.
+  int index = GetNextSpillIndex(is_double);
+  if (is_double) return LDoubleStackSlot::Create(index);
+  return LStackSlot::Create(index);
 }
 
 
@@ -737,6 +739,7 @@ LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
   return NULL;
 }
 
+
 void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
   ASSERT(is_building());
   current_block_ = block;