[NFC][InstCombine] Add test showing failure to sink into `resume` block

llvm/test/Transforms/InstCombine/sink-into-resume-block.ll

@@ -0,0 +1,63 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+; Check that InstCombine can sink instructions to the landingpad of the invoke.
+
+define void @t0_noop(i32 %arg) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+; CHECK-LABEL: @t0_noop(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[C:%.*]] = call i1 @cond()
+; CHECK-NEXT:    [[V0:%.*]] = add i32 [[ARG:%.*]], 42
+; CHECK-NEXT:    br i1 [[C]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    invoke void @simple_throw()
+; CHECK-NEXT:    to label [[INVOKE_CONT:%.*]] unwind label [[LPAD:%.*]]
+; CHECK:       invoke.cont:
+; CHECK-NEXT:    unreachable
+; CHECK:       lpad:
+; CHECK-NEXT:    [[EH:%.*]] = landingpad { i8*, i32 }
+; CHECK-NEXT:    cleanup
+; CHECK-NEXT:    call void @consume(i32 [[V0]])
+; CHECK-NEXT:    call void @destructor()
+; CHECK-NEXT:    resume { i8*, i32 } [[EH]]
+; CHECK:       if.end:
+; CHECK-NEXT:    [[V1:%.*]] = add i32 [[ARG]], 24
+; CHECK-NEXT:    call void @consume(i32 [[V1]])
+; CHECK-NEXT:    call void @sideeffect()
+; CHECK-NEXT:    ret void
+;
+entry:
+  %c = call i1 @cond()
+  %v0 = add i32 %arg, 42
+  %v1 = add i32 %arg, 24
+  br i1 %c, label %if.then, label %if.end
+
+if.then:
+  invoke void @simple_throw() to label %invoke.cont unwind label %lpad
+
+invoke.cont:
+  unreachable
+
+lpad:
+  %eh = landingpad { i8*, i32 } cleanup
+  call void @consume(i32 %v0)
+  call void @destructor()
+  resume { i8*, i32 } %eh
+
+if.end:
+  call void @consume(i32 %v1)
+  call void @sideeffect()
+  ret void
+}
+
+declare i1 @cond()
+
+declare void @sideeffect()
+
+declare void @simple_throw() noreturn
+
+declare void @destructor()
+
+declare void @consume(i32)
+
+declare dso_local i32 @__gxx_personality_v0(...)