[lld] Ensure NoTrapAfterNoreturn is false for the wasm backend (PR #65876)

[Heejin Ahn via llvm-commits]

================
@@ -1,33 +1,95 @@
-; RUN: llc < %s -asm-verbose=false -verify-machineinstrs | FileCheck %s
-; RUN: llc < %s -asm-verbose=false -fast-isel -fast-isel-abort=1 -verify-machineinstrs | FileCheck %s
+; The assertions in this file were autogenerated by
+; utils/update_llc_test_checks.py, but were hand-edited to add the
+; "end_function" lines to prevent the tests from passing when there
+; are superfluous instructions at the end of a function.
+; You can run update_llc_test_checks.py again, but please keep the
+; "end_function" lines intact when you commit.
 
-; Test that LLVM unreachable instruction and trap intrinsic are lowered to
-; wasm unreachable
+
+; The --trap-unreachable and --no-trap-after-noreturn options are ignored, and
+; should have no effect.
----------------
aheejin wrote:

```suggestion
; Wasm, to generate valid code, always internally sets `--trap-unreachable` to 1
; and `--no-trap-after-noreturn` to 0, and these command lines options, if
; explicitly given, are ignored. Various combinations of these options should
; have no effect and should not generate invalid code.
```

https://github.com/llvm/llvm-project/pull/65876