Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/test/Transforms/Inline/inline-musttail-varargs.ll

@@ -0,0 +1,23 @@
+; RUN: opt < %s -inline -instcombine -S | FileCheck %s
+; RUN: opt < %s -passes='cgscc(inline,function(instcombine))' -S | FileCheck %s
+
+; We can't inline this thunk yet, but one day we will be able to.  And when we
+; do, this test case will be ready.
+
+declare void @ext_method(i8*, i32)
+
+define linkonce_odr void @thunk(i8* %this, ...) {
+  %this_adj = getelementptr i8, i8* %this, i32 4
+  musttail call void (i8*, ...) bitcast (void (i8*, i32)* @ext_method to void (i8*, ...)*)(i8* %this_adj, ...)
+  ret void
+}
+
+define void @thunk_caller(i8* %p) {
+  call void (i8*, ...) @thunk(i8* %p, i32 42)
+  ret void
+}
+; CHECK-LABEL: define void @thunk_caller(i8* %p)
+; CHECK: call void (i8*, ...) @thunk(i8* %p, i32 42)
+
+; FIXME: Inline the thunk. This should be significantly easier than inlining
+; general varargs functions.