[sil-combine] Enable unchecked_trivial_bitcast for ownership.

Instruction just deals with trivial values.

Author: gottesmm

lib/SILOptimizer/SILCombiner/SILCombinerCastVisitors.cpp

@@ -664,9 +664,6 @@ visitRawPointerToRefInst(RawPointerToRefInst *RawToRef) {
 SILInstruction *
 SILCombiner::
 visitUncheckedTrivialBitCastInst(UncheckedTrivialBitCastInst *UTBCI) {
-  if (UTBCI->getFunction()->hasOwnership())
-    return nullptr;
-
   // (unchecked_trivial_bit_cast Y->Z
   //                                 (unchecked_trivial_bit_cast X->Y x))
   //   ->

test/SILOptimizer/sil_combine_ossa.sil

@@ -1996,8 +1996,8 @@ bb0(%0 : @owned $Builtin.NativeObject, %1 : $Builtin.RawPointer):
 // CHECK-LABEL: sil [ossa] @bitcast_combines : $@convention(thin) (@owned Builtin.NativeObject, Builtin.RawPointer) -> @owned (B, Optional<Builtin.Word>) {
 // CHECK: unchecked_ref_cast
 // CHECK-NOT: unchecked_bit_cast
-// XHECK: unchecked_trivial_bit_cast
-// XHECK-NOT: unchecked_trivial_bit_cast
+// CHECK: unchecked_trivial_bit_cast
+// CHECK-NOT: unchecked_trivial_bit_cast
 // CHECK: } // end sil function 'bitcast_combines'
 sil [ossa] @bitcast_combines : $@convention(thin) (@owned Builtin.NativeObject, Builtin.RawPointer) -> @owned (B, Optional<Builtin.Word>) {
 bb0(%0 : @owned $Builtin.NativeObject, %1 : $Builtin.RawPointer):