When inlining through an 'nounwind' call, mark inlined

calls 'nounwind'.  It is important for correct C++
exception handling that nounwind markings do not get
lost, so this transformation is actually needed for
correctness.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45218 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/Inline/2007-12-19-InlineNoUnwind.ll

@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s -o - | opt -inline | llvm-dis | grep nounwind
+; RUN: llvm-as < %s -o - | opt -inline | llvm-dis | grep unreachable
+
+declare i1 @extern()
+
+define internal i32 @test() {
+entry:
+	%n = call i1 @extern( )
+	br i1 %n, label %r, label %u
+r:
+	ret i32 0;
+u:
+	unwind
+}
+
+define i32 @caller() {
+	%X = call i32 @test( ) nounwind
+	ret i32 %X
+}