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

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 903608ac3a139f67a7574138152ce549062c3249..1c4a789229b4b6b10e1dca922f9d699124b875f5 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -106,9 +106,12 @@
 
   MemOperand ToMemOperand(InstructionOperand* op) 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() ? sp : fp, offset.offset());
   }
 };
@@ -1173,8 +1176,6 @@
     __ StubPrologue();
     frame()->SetRegisterSaveAreaSize(
         StandardFrameConstants::kFixedFrameSizeFromFp);
-  } else {
-    frame()->SetPCOnStack(false);
   }
 
   if (info()->is_osr()) {
@@ -1202,7 +1203,6 @@
 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.
@@ -1219,19 +1219,22 @@
     }
     __ mov(sp, fp);
     __ Pop(ra, fp);
+    __ Ret();
   } else if (descriptor->IsJSFunctionCall() || needs_frame_) {
     // Canonicalize JSFunction return sites for now.
     if (return_label_.is_bound()) {
       __ Branch(&return_label_);
-      return;
     } else {
       __ bind(&return_label_);
       __ mov(sp, fp);
       __ Pop(ra, fp);
-    }
-  }
-  if (pop_count != 0) {
-    __ DropAndRet(pop_count);
+      int pop_count = static_cast<int>(descriptor->StackParameterCount());
+      if (pop_count != 0) {
+        __ DropAndRet(pop_count);
+      } else {
+        __ Ret();
+      }
+    }
   } else {
     __ Ret();
   }