[clang][NFC] Cleanup some coroutine tests

[urnathan]

Summary

While working on PR55406 I noticed these two tests emit a warning about a missing unhandled_exception. That's irrelevant to what is being tested, but is unnecessary noise. I suspect the warning post-dates the tests.

[dblaikie]

sounds ok, thanks!

clang/test/CodeGenCoroutines/coro-ret-void.cpp

 // RUN: %clang_cc1 -no-opaque-pointers -std=c++20 -triple=x86_64-unknown-linux-gnu -emit-llvm %s -o - -disable-llvm-passes | FileCheck %s
 
 #include "Inputs/coroutine.h"
 
 struct coro1 {
   struct promise_type {
     coro1 get_return_object();
     std::suspend_never initial_suspend();
     std::suspend_never final_suspend() noexcept;
     void return_void();
+    void unhandled_exception() noexcept;
   };
 };
 
 coro1 f() {
   co_await std::suspend_never{};
 }
 
 // CHECK-LABEL: define{{.*}} void @_Z1fv(

 // CHECK-NEXT: call void @_ZN5coro112promise_type11return_voidEv(%"struct.coro1::promise_type"*
 
 struct coro2 {
   struct promise_type {
     coro2 get_return_object();
     std::suspend_never initial_suspend();
     std::suspend_never final_suspend() noexcept;
     void return_value(int);
+    void unhandled_exception() noexcept;
   };
 };
 
 coro2 g() {
   co_return 42;
 }
 
 // CHECK-LABEL: define{{.*}} void @_Z1gv(
 // CHECK: call void @_ZNSt13suspend_never12await_resumeEv(%"struct.std::suspend_never"*
 // CHECK: call void @_ZN5coro212promise_type12return_valueEi(%"struct.coro2::promise_type"* {{[^,]*}} %__promise, i32 noundef 42)

clang/test/CoverageMapping/coroutine.cpp

 };
 
 template <>
 struct std::coroutine_traits<int, int> {
   struct promise_type {
     int get_return_object();
     suspend_always initial_suspend();
     suspend_always final_suspend() noexcept;
+    void unhandled_exception() noexcept;
     void return_value(int);
   };
 };
 
 // CHECK-LABEL: _Z2f1i:
 int f1(int x) {       // CHECK-NEXT: File 0, [[@LINE]]:15 -> [[@LINE+8]]:2 = #0
   if (x > 42) {       // CHECK-NEXT: File 0, [[@LINE]]:7 -> [[@LINE]]:13 = #0
                       // CHECK-NEXT: Branch,File 0, [[@LINE-1]]:7 -> [[@LINE-1]]:13 = #1, (#0 - #1)
     ++x;              // CHECK-NEXT: Gap,File 0, [[@LINE-2]]:14 -> [[@LINE-2]]:15 = #1
   } else {            // CHECK-NEXT: File 0, [[@LINE-3]]:15 -> [[@LINE]]:4 = #1
     co_return x + 42; // CHECK-NEXT: Gap,File 0, [[@LINE-1]]:4 -> [[@LINE-1]]:10 = (#0 - #1)
   }                   // CHECK-NEXT: File 0, [[@LINE-2]]:10 -> [[@LINE]]:4 = (#0 - #1)
   co_return x;        // CHECK-NEXT: Gap,File 0, [[@LINE-1]]:4 -> [[@LINE]]:3 = #1
 } // CHECK-NEXT: File 0, [[@LINE-1]]:3 -> [[@LINE-1]]:14 = #1