Revert of [turbofan] Various fixes to allow unboxed doubles as arguments in registers...

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 27d4889c34df5cca59ffeee94723d5116398ff06..58adc2509883c6c5fcd002d1871c680136fae345 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -184,9 +184,12 @@
 
   MemOperand ToMemOperand(InstructionOperand* op, MacroAssembler* masm) const {
     DCHECK(op != NULL);
+    DCHECK(!op->IsRegister());
+    DCHECK(!op->IsDoubleRegister());
     DCHECK(op->IsStackSlot() || op->IsDoubleStackSlot());
-    FrameOffset offset =
-        linkage()->GetFrameOffset(AllocatedOperand::cast(op)->index(), frame());
+    // The linkage computes where all spill slots are located.
+    FrameOffset offset = linkage()->GetFrameOffset(
+        AllocatedOperand::cast(op)->index(), frame(), 0);
     return MemOperand(offset.from_stack_pointer() ? masm->StackPointer() : fp,
                       offset.offset());
   }
@@ -1115,8 +1118,6 @@
     __ StubPrologue();
     frame()->SetRegisterSaveAreaSize(
         StandardFrameConstants::kFixedFrameSizeFromFp);
-  } else {
-    frame()->SetPCOnStack(false);
   }
 
   if (info()->is_osr()) {
@@ -1148,7 +1149,6 @@
 void CodeGenerator::AssembleReturn() {
   CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
   int stack_slots = frame()->GetSpillSlotCount();
-  int pop_count = static_cast<int>(descriptor->StackParameterCount());
   if (descriptor->kind() == CallDescriptor::kCallAddress) {
     if (frame()->GetRegisterSaveAreaSize() > 0) {
       // Remove this frame's spill slots first.
@@ -1169,19 +1169,24 @@
 
     __ Mov(csp, fp);
     __ Pop(fp, lr);
+    __ Ret();
   } else if (descriptor->IsJSFunctionCall() || needs_frame_) {
     // Canonicalize JSFunction return sites for now.
     if (return_label_.is_bound()) {
       __ B(&return_label_);
-      return;
     } else {
       __ Bind(&return_label_);
       __ Mov(jssp, fp);
       __ Pop(fp, lr);
-    }
-  }
-  __ Drop(pop_count);
-  __ Ret();
+      int pop_count = static_cast<int>(descriptor->StackParameterCount());
+      if (pop_count != 0) {
+        __ Drop(pop_count);
+      }
+      __ Ret();
+    }
+  } else {
+    __ Ret();
+  }
 }