Fix compilation of an assert.
Fix compilation of an assert.

The asserts check the length of the endian-converted words
vector with the reported number of words in the instruction.

LukasBanana/SPIRV-Tools,umar456/SPIRV-Tools,KhronosGroup/SPIRV-Tools,fuchsia-mirror/third_party-spirv-tools,dneto0/SPIRV-Tools,pierremoreau/SPIRV-Tools,umar456/SPIRV-Tools,pierremoreau/SPIRV-Tools,pierremoreau/SPIRV-Tools,antiagainst/SPIRV-Tools,pierremoreau/SPIRV-Tools,greg-lunarg/SPIRV-Tools,pierremoreau/SPIRV-Tools,antiagainst/SPIRV-Tools,dneto0/SPIRV-Tools,KhronosGroup/SPIRV-Tools,pierremoreau/SPIRV-Tools,fuchsia-mirror/third_party-spirv-tools,KhronosGroup/SPIRV-Tools,dneto0/SPIRV-Tools,dneto0/SPIRV-Tools,dneto0/SPIRV-Tools,dneto0/SPIRV-Tools,dneto0/SPIRV-Tools,antiagainst/SPIRV-Tools,KhronosGroup/SPIRV-Tools,greg-lunarg/SPIRV-Tools,greg-lunarg/SPIRV-Tools,antiagainst/SPIRV-Tools,KhronosGroup/SPIRV-Tools,LukasBanana/SPIRV-Tools,pierremoreau/SPIRV-Tools,fuchsia-mirror/third_party-spirv-tools,dneto0/SPIRV-Tools,LukasBanana/SPIRV-Tools,antiagainst/SPIRV-Tools,KhronosGroup/SPIRV-Tools,pierremoreau/SPIRV-Tools,umar456/SPIRV-Tools,KhronosGroup/SPIRV-Tools,KhronosGroup/SPIRV-Tools