[NVPTX] Fix lack of `.noreturn` on certain functions for aliases

[jhuber6]

Summary

Forgot to include this special handling on the declaration of the alias
function.

llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp

if (GA.hasLinkOnceLinkage() || GA.hasWeakLinkage() ||
     report_fatal_error("NVPTX aliasee must not be '.weak'");
 
   OS << "\n";
   emitLinkageDirective(F, OS);
   OS << ".func ";
   printReturnValStr(F, OS);
   OS << Name->getName();
   emitFunctionParamList(F, OS);
+  if (shouldEmitPTXNoReturn(F, TM))
+    OS << "\n.noreturn";
   OS << ";\n";
 
   OS << ".alias " << Name->getName() << ", " << F->getName() << ";\n";
 
   OutStreamer->emitRawText(OS.str());
 }
 
 void NVPTXAsmPrinter::emitHeader(Module &M, raw_ostream &O,

llvm/test/CodeGen/NVPTX/alias.ll

-; RUN: llc < %s -march=nvptx64 -mcpu=sm_30 -mattr=+ptx63 | FileCheck %s
+; RUN: llc < %s -march=nvptx64 -mcpu=sm_30 -mattr=+ptx64 | FileCheck %s
 
 define i32 @a() { ret i32 0 }
 @b = internal alias i32 (), ptr @a
 @c = internal alias i32 (), ptr @a
 
 define void @foo(i32 %0, ptr %1) { ret void }
 @bar = alias i32 (), ptr @foo
 
+define void @noreturn() #0 {
+  ret void
+}
+@noreturn_alias = alias i32 (), ptr @noreturn
+
+attributes #0 = { noreturn }
+
 ; CHECK: .visible .func  (.param .b32 func_retval0) a()
 
 ;      CHECK: .visible .func foo(
 ; CHECK-NEXT:         .param .b32 foo_param_0,
 ; CHECK-NEXT:         .param .b64 foo_param_1
 ; CHECK-NEXT: )
 
+;      CHECK: .visible .func noreturn()
+; CHECK-NEXT: .noreturn
+
 ;      CHECK: .visible .func  (.param .b32 func_retval0) b();
 ; CHECK-NEXT: .alias b, a;
 
 ;      CHECK: .visible .func  (.param .b32 func_retval0) c();
 ; CHECK-NEXT: .alias c, a;
 
 ;      CHECK: .visible .func bar(
 ; CHECK-NEXT:         .param .b32 foo_param_0,
 ; CHECK-NEXT:         .param .b64 foo_param_1
 ; CHECK-NEXT: );
 ; CHECK-NEXT: .alias bar, foo;
+
+;      CHECK: .visible .func noreturn_alias()
+; CHECK-NEXT: .noreturn;
+; CHECK-NEXT: .alias noreturn_alias, noreturn;