[Local] Don't remove invoke of non-willreturn function

The code was only checking for memory side-effects, but not for
divergence side-effects. Replace this with a generic check.

(cherry picked from commit 2e101cc)

Author: nikic

llvm/lib/Transforms/Utils/Local.cpp

@@ -2350,7 +2350,7 @@ static bool markAliveBlocks(Function &F,
         changeToUnreachable(II, false, DTU);
         Changed = true;
       } else if (II->doesNotThrow() && canSimplifyInvokeNoUnwind(&F)) {
-        if (II->use_empty() && II->onlyReadsMemory()) {
+        if (II->use_empty() && !II->mayHaveSideEffects()) {
           // jump to the normal destination branch.
           BasicBlock *NormalDestBB = II->getNormalDest();
           BasicBlock *UnwindDestBB = II->getUnwindDest();

llvm/test/Transforms/SimplifyCFG/invoke.ll

@@ -83,6 +83,7 @@ lpad:
 define i32 @invoke_readonly_may_not_return() nounwind personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
 ; CHECK-LABEL: @invoke_readonly_may_not_return(
 ; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CALL:%.*]] = call i32 @readonly()
 ; CHECK-NEXT:    ret i32 3
 ;
 entry: