[HIP][CUDA] Support for header file types .hiph, .cuh (fixes 148972)#148973

alexbaretta wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

alexbaretta:clangd-fix-cuda-hip-header-language-detectionalexbaretta/llvm-project:clangd-fix-cuda-hip-header-language-detectionCopy head branch name to clipboard