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

src/compiler/ia32/code-generator-ia32.cc

Index: src/compiler/ia32/code-generator-ia32.cc
diff --git a/src/compiler/ia32/code-generator-ia32.cc b/src/compiler/ia32/code-generator-ia32.cc
index 7b70f21babb3846c8088304abb5879d6f5d10e41..298627b55bd35dfb1ba40d35da6b49fa16eca1f6 100644
--- a/src/compiler/ia32/code-generator-ia32.cc
+++ b/src/compiler/ia32/code-generator-ia32.cc
@@ -46,10 +46,10 @@
       return Operand(ToDoubleRegister(op));
     }
     DCHECK(op->IsStackSlot() || op->IsDoubleStackSlot());
-    FrameOffset offset =
-        linkage()->GetFrameOffset(AllocatedOperand::cast(op)->index(), frame());
-    return Operand(offset.from_stack_pointer() ? esp : ebp,
-                   offset.offset() + extra);
+    // The linkage computes where all spill slots are located.
+    FrameOffset offset = linkage()->GetFrameOffset(
+        AllocatedOperand::cast(op)->index(), frame(), extra);
+    return Operand(offset.from_stack_pointer() ? esp : ebp, offset.offset());
   }
 
   Operand HighOperand(InstructionOperand* op) {
@@ -1325,26 +1325,31 @@
         }
       }
       __ pop(ebp);  // Pop caller's frame pointer.
+      __ ret(0);
     } else {
       // No saved registers.
       __ mov(esp, ebp);  // Move stack pointer back to frame pointer.
       __ pop(ebp);       // Pop caller's frame pointer.
+      __ ret(0);
     }
   } else if (descriptor->IsJSFunctionCall() || needs_frame_) {
     // Canonicalize JSFunction return sites for now.
     if (return_label_.is_bound()) {
       __ jmp(&return_label_);
-      return;
     } else {
       __ bind(&return_label_);
       __ mov(esp, ebp);  // Move stack pointer back to frame pointer.
       __ pop(ebp);       // Pop caller's frame pointer.
-    }
-  }
-  size_t pop_size = descriptor->StackParameterCount() * kPointerSize;
-  // Might need ecx for scratch if pop_size is too big.
-  DCHECK_EQ(0, descriptor->CalleeSavedRegisters() & ecx.bit());
-  __ Ret(static_cast<int>(pop_size), ecx);
+      int pop_count = static_cast<int>(descriptor->StackParameterCount());
+      if (pop_count == 0) {
+        __ ret(0);
+      } else {
+        __ Ret(pop_count * kPointerSize, ebx);
+      }
+    }
+  } else {
+    __ ret(0);
+  }
 }