Update lowering of `spv_[u|s]dot` intrinsics to use SPIRV dot product instructions

[inbelic]

In SPIRVInstructionSelector.cpp update selectIntegerDot to enable the use of the integer dot product instructions that are now enabled by the SPV_KHR_integer_dot_product extension or SPIRV version > 1.6.

See #113623 (comment).