[JIT] Fix some more missing endian conversions in RuntimeDyld

[dsanders]

Summary

This fixes MachO_i386_eh_frame.s on a big-endian Mips host.

[lhames]

Looks good to me. Thanks very much Daniel!

lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp

 template <typename Impl>
 unsigned char *RuntimeDyldMachOCRTPBase<Impl>::processFDE(unsigned char *P,
                                                           int64_t DeltaForText,
                                                           int64_t DeltaForEH) {
   typedef typename Impl::TargetPtrT TargetPtrT;
 
   DEBUG(dbgs() << "Processing FDE: Delta for text: " << DeltaForText
                << ", Delta for EH: " << DeltaForEH << "\n");
-  uint32_t Length = *((uint32_t *)P);
+  uint32_t Length = readBytesUnaligned(P, 4);
   P += 4;
   unsigned char *Ret = P + Length;
-  uint32_t Offset = *((uint32_t *)P);
+  uint32_t Offset = readBytesUnaligned(P, 4);
   if (Offset == 0) // is a CIE
     return Ret;
 
   P += 4;
-  TargetPtrT FDELocation = *((TargetPtrT*)P);
+  TargetPtrT FDELocation = readBytesUnaligned(P, sizeof(TargetPtrT));
   TargetPtrT NewLocation = FDELocation - DeltaForText;
-  *((TargetPtrT*)P) = NewLocation;
+  writeBytesUnaligned(NewLocation, P, sizeof(TargetPtrT));
+
   P += sizeof(TargetPtrT);
 
   // Skip the FDE address range
   P += sizeof(TargetPtrT);
 
   uint8_t Augmentationsize = *P;
   P += 1;
   if (Augmentationsize != 0) {
-    TargetPtrT LSDA = *((TargetPtrT *)P);
+    TargetPtrT LSDA = readBytesUnaligned(P, sizeof(TargetPtrT));
     TargetPtrT NewLSDA = LSDA - DeltaForEH;
-    *((TargetPtrT *)P) = NewLSDA;
+    writeBytesUnaligned(NewLSDA, P, sizeof(TargetPtrT));
   }
 
   return Ret;
 }
 
 static int64_t computeDelta(SectionEntry *A, SectionEntry *B) {
   int64_t ObjDistance = A->ObjAddress - B->ObjAddress;
   int64_t MemDistance = A->LoadAddress - B->LoadAddress;