[mlir][tblgen] Adds support for embedded LIT tests in TableGen records#158017

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

jkshtj:jkshtj/tblgen-embedded-lit-testsjkshtj/llvm-project:jkshtj/tblgen-embedded-lit-testsCopy head branch name to clipboard