Fix VS2017 Warnings (#1602)
Fix VS2017 Warnings (#1602)

* Fix VS2017 Warnings

* Update slang-visitor.h

Co-authored-by: jsmall-nvidia <ba36e50ee2a280bd63d65c073bf01958e3433531@nvidia.com>
csyonghe/slang,shader-slang/slang,shader-slang/slang,csyonghe/slang,shader-slang/slang,csyonghe/slang