[turbofan] Various fixes to allow unboxed doubles as arguments in registers and on the stack.

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index b472feb0af08d23f0ab20129cef0fc113ab685fe..e9a4a5aaf6f4fa7a348a8da57b6d484c0f350fef 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -147,12 +147,9 @@ class ArmOperandConverter final : public InstructionOperandConverter {
 
   MemOperand ToMemOperand(InstructionOperand* op) const {
     DCHECK(op != NULL);
-    DCHECK(!op->IsRegister());
-    DCHECK(!op->IsDoubleRegister());
     DCHECK(op->IsStackSlot() || op->IsDoubleStackSlot());
-    // The linkage computes where all spill slots are located.
-    FrameOffset offset = linkage()->GetFrameOffset(
-        AllocatedOperand::cast(op)->index(), frame(), 0);
+    FrameOffset offset =
+        linkage()->GetFrameOffset(AllocatedOperand::cast(op)->index(), frame());
     return MemOperand(offset.from_stack_pointer() ? sp : fp, offset.offset());
   }
 };
@@ -992,6 +989,8 @@ void CodeGenerator::AssemblePrologue() {
     __ StubPrologue();
     frame()->SetRegisterSaveAreaSize(
         StandardFrameConstants::kFixedFrameSizeFromFp);
+  } else {
+    frame()->SetPCOnStack(false);
   }
 
   if (info()->is_osr()) {
@@ -1019,6 +1018,7 @@ void CodeGenerator::AssemblePrologue() {
 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.
@@ -1041,23 +1041,17 @@ void CodeGenerator::AssembleReturn() {
       }
     }
     __ LeaveFrame(StackFrame::MANUAL);
-    __ 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_);
       __ LeaveFrame(StackFrame::MANUAL);
-      int pop_count = static_cast<int>(descriptor->StackParameterCount());
-      if (pop_count != 0) {
-        __ Drop(pop_count);
-      }
-      __ Ret();
     }
-  } else {
-    __ Ret();
   }
+  __ Ret(pop_count);
 }