[Transforms] Preserve metadata when converting invoke to call.

The `changeToCall` function did not preserve the invoke's metadata.
Currently, there is probably no metadata that depends on being applied
on a CallInst or InvokeInst. Therefore we can replace the instruction's
metadata.

This fixes http://llvm.org/PR39994

Suggested-by: Moritz Kreutzer <moritz.kreutzer@siemens.com>

Differential Revision: https://reviews.llvm.org/D55666

llvm-svn: 349170

llvm/lib/Transforms/Utils/Local.cpp

@@ -1970,6 +1970,7 @@ static void changeToCall(InvokeInst *II, DomTreeUpdater *DTU = nullptr) {
   NewCall->setCallingConv(II->getCallingConv());
   NewCall->setAttributes(II->getAttributes());
   NewCall->setDebugLoc(II->getDebugLoc());
+  NewCall->copyMetadata(*II);
   II->replaceAllUsesWith(NewCall);
 
   // Follow the call by a branch to the normal destination.

llvm/test/Transforms/PruneEH/looptest.ll

@@ -0,0 +1,44 @@
+; RUN: opt < %s -prune-eh -S | FileCheck %s
+
+declare void @nounwind() nounwind
+
+define internal void @foo() {
+	call void @nounwind()
+	ret void
+}
+
+; CHECK-LABEL: @caller
+define i32 @caller(i32 %n) personality i32 (...)* @__gxx_personality_v0 {
+entry:
+  br label %for
+
+for:
+  %j = phi i32 [0, %entry], [%j.inc, %inc]
+  %j.cmp = icmp slt i32 %j, %n
+  br i1 %j.cmp, label %body, label %exit, !llvm.loop !0
+
+body:
+; CHECK: call void @foo(), !llvm.mem.parallel_loop_access !0
+	invoke void @foo( )
+			to label %Normal unwind label %Except, !llvm.mem.parallel_loop_access !0
+  br label %inc
+
+inc:
+  %j.inc = add nuw nsw i32 %j, 1
+  br label %for, !llvm.loop !0
+
+exit:
+  br label %Normal
+
+Normal:
+	ret i32 0
+
+Except:
+        landingpad { i8*, i32 }
+                catch i8* null
+	ret i32 1
+}
+
+declare i32 @__gxx_personality_v0(...)
+
+!0 = distinct !{!0}