[PATCH] Fix undefined behavior (shift of negative value) in RuntimeDyldMachOAArch64::encodeAddend.

[Alexey Samsonov]

Hi lhames, ributzka,

http://reviews.llvm.org/D6908

Files:
  lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h

Index: lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h
===================================================================
--- lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h
+++ lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOAArch64.h
@@ -183,8 +183,8 @@
       assert(isInt<33>(Addend) && "Invalid page reloc value.");
 
       // Encode the addend into the instruction.
-      uint32_t ImmLoValue = (uint32_t)(Addend << 17) & 0x60000000;
-      uint32_t ImmHiValue = (uint32_t)(Addend >> 9) & 0x00FFFFE0;
+      uint32_t ImmLoValue = ((uint64_t)Addend << 17) & 0x60000000;
+      uint32_t ImmHiValue = ((uint64_t)Addend >> 9) & 0x00FFFFE0;
       *p = (*p & 0x9F00001F) | ImmHiValue | ImmLoValue;
       break;
     }

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