PPC64: [turbofan] Word32 loads should be unsigned.

src/compiler/ppc/instruction-codes-ppc.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_PPC_INSTRUCTION_CODES_PPC_H_
 #define V8_COMPILER_PPC_INSTRUCTION_CODES_PPC_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 94 matching lines @@
   V(PPC_DoubleConstruct)           \
   V(PPC_BitcastInt32ToFloat32)     \
   V(PPC_BitcastFloat32ToInt32)     \
   V(PPC_BitcastInt64ToDouble)      \
   V(PPC_BitcastDoubleToInt64)      \
   V(PPC_LoadWordS8)                \
   V(PPC_LoadWordU8)                \
   V(PPC_LoadWordS16)               \
   V(PPC_LoadWordU16)               \
   V(PPC_LoadWordS32)               \
+  V(PPC_LoadWordU32)               \
   V(PPC_LoadWord64)                \
   V(PPC_LoadFloat32)               \
   V(PPC_LoadDouble)                \
   V(PPC_StoreWord8)                \
   V(PPC_StoreWord16)               \
   V(PPC_StoreWord32)               \
   V(PPC_StoreWord64)               \
   V(PPC_StoreFloat32)              \
   V(PPC_StoreDouble)
 
@@ skipping 12 matching lines @@
 // MRR = [register + register]
 #define TARGET_ADDRESSING_MODE_LIST(V) \
   V(MRI) /* [%r0 + K] */               \
   V(MRR) /* [%r0 + %r1] */
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_PPC_INSTRUCTION_CODES_PPC_H_