[llvm] [FastISel] Support unreachable with NoTrapAfterNoReturn (PR #118296)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,13 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -O0 -trap-unreachable -no-trap-after-noreturn -fast-isel-abort=3 < %s | FileCheck %s
+
+declare void @foo()
+
+define void @noreturn_unreachable() nounwind {
+; CHECK-LABEL: noreturn_unreachable:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    callq foo at PLT
+  call void @foo() noreturn
+  unreachable
+}
----------------
arsenm wrote:

Check invoke case? 

https://github.com/llvm/llvm-project/pull/118296