Revert "Fix: On wasm targets, call panic_in_cleanup if panic occurs in cleanup"

This reverts commit acbfd79acf.

tests/codegen-llvm/double_panic_wasm.rs

@@ -1,34 +0,0 @@
-//@ compile-flags: -C panic=unwind -Copt-level=0
-//@ needs-unwind
-//@ only-wasm32
-
-#![crate_type = "lib"]
-
-// Test that `panic_in_cleanup` is called on webassembly targets when a panic
-// occurs in a destructor during unwinding.
-
-extern "Rust" {
-    fn may_panic();
-}
-
-struct PanicOnDrop;
-
-impl Drop for PanicOnDrop {
-    fn drop(&mut self) {
-        unsafe { may_panic() }
-    }
-}
-
-// CHECK-LABEL: @double_panic
-// CHECK: invoke void @may_panic()
-// CHECK: invoke void @{{.+}}drop_in_place{{.+}}
-// CHECK: unwind label %[[TERMINATE:.*]]
-//
-// CHECK: [[TERMINATE]]:
-// CHECK: call void @{{.*panic_in_cleanup}}
-// CHECK: unreachable
-#[no_mangle]
-pub fn double_panic() {
-    let _guard = PanicOnDrop;
-    unsafe { may_panic() }
-}

tests/codegen-llvm/terminating-catchpad.rs

@@ -9,10 +9,6 @@
 // Ensure a catch-all generates:
 // - `catchpad ... [ptr null]` on Wasm (otherwise LLVM gets confused)
 // - `catchpad ... [ptr null, i32 64, ptr null]` on Windows (otherwise we catch SEH exceptions)
-//
-// Unlike on windows, on Wasm, we specifically do want to catch foreign
-// exceptions. To catch only C++ exceptions we'd need to call
-// @llvm.wasm.get.exception and @llvm.wasm.get.ehselector in the catchpad.
 
 #![feature(no_core, lang_items, rustc_attrs)]
 #![crate_type = "lib"]
@@ -40,14 +36,8 @@ fn panic_cannot_unwind() -> ! {
 #[no_mangle]
 #[rustc_nounwind]
 pub fn doesnt_unwind() {
-    // CHECK: catchswitch within none [label %{{.*}}] unwind to caller
     // emscripten: %catchpad = catchpad within %catchswitch [ptr null]
     // wasi: %catchpad = catchpad within %catchswitch [ptr null]
     // seh: %catchpad = catchpad within %catchswitch [ptr null, i32 64, ptr null]
-    //
-    // We don't call these intrinsics on wasm targets so we generate a catch_all
-    // instruction which also picks up foreign exceptions
-    // NOT: @llvm.wasm.get.exception
-    // NOT: @llvm.wasm.get.ehselector
     unwinds();
 }