Bug 569608 - gfxTextRunWordCache.cpp compilation failure on mingw-w64 due to pointer to long cast loosing precision r=vladimir

--HG--
extra : rebase_source : 3142d17d9c28beb1a2034a555b2ffe4a95e71f9c

gfx/thebes/src/gfxTextRunWordCache.cpp

@@ -945,7 +945,7 @@ TextRunWordCache::CacheHashEntry::HashKey(const KeyTypePointer aKey)
     PRUint32 fontSetGen;
     LL_L2UI(fontSetGen, aKey->mUserFontSetGeneration);
 
-    return aKey->mStringHash + fontSetGen + (long)aKey->mFontOrGroup + aKey->mAppUnitsPerDevUnit +
+    return aKey->mStringHash + fontSetGen + (PRUint32)(intptr_t)aKey->mFontOrGroup + aKey->mAppUnitsPerDevUnit +
         aKey->mIsDoubleByteText + aKey->mIsRTL*2 + aKey->mEnabledOptionalLigatures*4 +
         aKey->mOptimizeSpeed*8;
 }