[x265] Compile error, high bit-depth and GCC 4.9.2

[Sami Inkinen]

Hi,

I got a compile error with GCC 4.9.2 when compiling a high bit-depth
executable.

x265 version 1.4+382-f9a54da18713

[ 69%] Building CXX object encoder/CMakeFiles/encoder.dir/slicetype.cpp.obj
c:/x265/x265/source/encoder/slicetype.cpp: In member function 'void
x265::EstimateRow::estimateCUCost(x265::Lowres**, x265::ReferencePlanes*,
int, int, int, int, int, bool*)':
c:/x265/x265/source/encoder/slicetype.cpp:1702:121: warning: iteration 17u
invokes undefined behavior [-Waggressive-loop-optimizations]
neighbours[1][i]           = (neighbours[0][i - 1]      + (neighbours[0][i]
<< 1)      + neighbours[0][i + 1]      + 2) >> 2;

cc1plus.exe: note: containing loop

The encoder doesn't seem to use weightp:

x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0%

I also tested a different build and weighted P-frames are not used there
either.

-Sami
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