[llvm] [NVPTX] Add support for "blocksareclusters" kernel attr (PR #152265)

[Alex MacLean via llvm-commits]

================
@@ -452,6 +456,13 @@ void NVPTXAsmPrinter::emitKernelFunctionDirectives(const Function &F,
                "should be 0 as well");
       }
     }
+
+    if (BlocksAreClusters && STI->getPTXVersion() >= 90) {
+      assert(!(ReqNTID.empty() || getClusterDim(F).empty()) &&
+             "blocksareclusters requires reqntid and cluster_dim");
+      O << ".blocksareclusters\n";
+    }
----------------
AlexMaclean wrote:

I suppose you could add `F.getSubprogram()` for the 3rd argument, which would cause it to spit out the line where the function starts if debug info is attached. Without debug info it's going to spit out "<unknown>:0:0" no matter what. 

https://github.com/llvm/llvm-project/pull/152265