Removing this as part of the revert done in 69da3b6

AaronBallman · AaronBallman · commit 9368bf9023ee · 2022-05-25T13:45:17.000-04:00
This appears to have been added in a follow-up commit that I missed.
diff --git a/clang/lib/CodeGen/CGStmtOpenMP.cpp b/clang/lib/CodeGen/CGStmtOpenMP.cpp
@@ -6317,7 +6317,6 @@ static void emitOMPAtomicExpr(CodeGenFunction &CGF, OpenMPClauseKind Kind,
   case OMPC_bind:
   case OMPC_align:
   case OMPC_cancellation_construct_type:
-  case OMPC_fail:
     llvm_unreachable("Clause is not allowed in 'omp atomic'.");
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -6317,7 +6317,6 @@ static void emitOMPAtomicExpr(CodeGenFunction &CGF, OpenMPClauseKind Kind,`
`6317`	`6317`	`case OMPC_bind:`
`6318`	`6318`	`case OMPC_align:`
`6319`	`6319`	`case OMPC_cancellation_construct_type:`
`6320`		`- case OMPC_fail:`
`6321`	`6320`	`llvm_unreachable("Clause is not allowed in 'omp atomic'.");`
`6322`	`6321`	`}`
`6323`	`6322`	`}`