[win][arm64ec] Fix duplicate errors with the dontcall attribute

Author: dpaoliello

llvm/lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -1148,9 +1148,11 @@ bool FastISel::lowerCall(const CallInst *CI) {
   CLI.setCallee(RetTy, FuncTy, CI->getCalledOperand(), std::move(Args), *CI)
       .setTailCall(IsTailCall);
 
-  diagnoseDontCall(*CI);
-
-  return lowerCallTo(CLI);
+  if (lowerCallTo(CLI)) {
+    diagnoseDontCall(*CI);
+    return true;
+  } else
+    return false;
 }
 
 bool FastISel::selectCall(const User *I) {

llvm/test/CodeGen/AArch64/arm64ec-dont-call.ll

@@ -0,0 +1,21 @@
+; RUN: not llc -mtriple arm64ec-windows-msvc -o - %s 2>&1 | FileCheck %s
+
+define void @baz() #0 {
+  call void @foo()
+  ret void
+}
+
+define void @foo() #1 {
+  ret void
+}
+
+attributes #0 = { noinline optnone }
+attributes #1 = { "dontcall-error"="oh no foo" }
+
+; Regression test for `dontcall-error` for Arm64EC. Since this attribute is
+; checked both by FastISel and SelectionDAGBuilder, and FastISel was bailing for
+; Arm64EC AFTER doing the check, we ended up with duplicate copies of this
+; error.
+
+; CHECK: error: call to #foo marked "dontcall-error": oh no foo
+; CHECK-NOT: error: