[clang] [AMDGPU][clang] Fix clang driver check for multiple sanitizer arguments (PR #166851)

[Amit Kumar Pandey via cfe-commits]

ampandey-1995 wrote:

Can this functionality be included in this function [diagnoseUnsupportedSanitizers](https://github.com/llvm/llvm-project/blob/0875755f5275dc7a84b1aeb526b7822b47a733c9/clang/lib/Driver/ToolChains/AMDGPU.h#L158) as we try to warn and skip processing of the unsupported sanitizer options.

https://github.com/llvm/llvm-project/pull/166851