[Bug] Fix warnings (#4730)
[Bug] Fix warnings (#4730)

* fix warnings

* Update taichi/codegen/spirv/spirv_codegen.cpp

Co-authored-by: Ye Kuang <4b45f682edc0f60a7ee973114ff9390ff2416366@users.noreply.github.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi