[llvm] [CodeGen] Do not emit TRAP for `unreachable` after `@llvm.trap` (PR #94570)

[Igor Kudrin via llvm-commits]

================
@@ -1836,6 +1837,16 @@ class CallInst : public CallBase {
   bool canReturnTwice() const { return hasFnAttr(Attribute::ReturnsTwice); }
   void setCanReturnTwice() { addFnAttr(Attribute::ReturnsTwice); }
 
+  bool isNonContinuableTrap() const {
----------------
igorkudrin wrote:

[`debugtrap`](https://llvm.org/docs/LangRef.html#llvm-debugtrap-intrinsic) is not `noreturn`; it acts like a breakpoint and implies continuation.

https://github.com/llvm/llvm-project/pull/94570