Mark x64 SSE constants as rematerializable

Author: nmraz

crates/codegen/src/target/x64.rs

@@ -477,11 +477,13 @@ impl MachineRegalloc for X64Machine {
             X64Instr::MovRmS32(..)
             | X64Instr::MovRU32(..)
             | X64Instr::FuncAddrRel(..)
-            | X64Instr::StackAddr(..) => Some(RematCost::CheapAsCopy),
+            | X64Instr::StackAddr(..)
+            | X64Instr::SseMovRZ => Some(RematCost::CheapAsCopy),
             X64Instr::MovRI64(..)
             | X64Instr::FuncAddrAbs(..)
             | X64Instr::MovRRbp { .. }
-            | X64Instr::MovsdRRbp { .. } => Some(RematCost::CheapAsLoad),
+            | X64Instr::MovsdRRbp { .. }
+            | X64Instr::MovsdConstRel(..) => Some(RematCost::CheapAsLoad),
             _ => None,
         }
     }