[Turbofan] Allow compiler to elide complex aliasing code.

src/compiler/register-allocator.h

Index: src/compiler/register-allocator.h
diff --git a/src/compiler/register-allocator.h b/src/compiler/register-allocator.h
index 640acebd4e838812bf973e0b0afd5ca1fe3fe2d1..caadcba18b31759d92d30e0a00ef383490f76387 100644
--- a/src/compiler/register-allocator.h
+++ b/src/compiler/register-allocator.h
@@ -964,11 +964,6 @@ class RegisterAllocator : public ZoneObject {
   const int* allocatable_register_codes() const {
     return allocatable_register_codes_;
   }
-  // Returns true if registers do not combine to form larger registers, i.e.
-  // no complex aliasing detection is required. This is always true for the
-  // general register pass, and true for the FP register pass except for arm
-  // and mips archs.
-  bool no_combining() const { return no_combining_; }
 
   // TODO(mtrofin): explain why splitting in gap START is always OK.
   LifetimePosition GetSplitPositionForInstruction(const LiveRange* range,