[debuginfo-tests] Recommit test sret.cpp

[Orlando]

Summary

This test was accidently removed when the directory structure was shuffled
around for dexter in f78c236efda8.

[aprantl]

Despite its apparent simplicity this is very high-value test and has caught tons of issues in the past!

[Orlando]

Glad to add it back then! Thanks.

debuginfo-tests/llgdb-tests/sret.cpp

+// RUN: %clangxx %target_itanium_abi_host_triple -O0 -g %s -c -o %t.o
+// RUN: %clangxx %target_itanium_abi_host_triple %t.o -o %t.out
+// RUN: %test_debuginfo %s %t.out
+// Radar 8775834
+// DEBUGGER: break 62
+// DEBUGGER: r
+// DEBUGGER: p a
+// CHECK: ${{[0-9]+}} =
+// LLDB does not print artificial members.
+// CHECK:  {{(_vptr\$A =)?.*}}m_int = 12
+
+class A
+{
+public:
+    A (int i=0);
+    A (const A& rhs);
+    const A&
+    operator= (const A& rhs);
+    virtual ~A() {}
+
+    int get_int();
+
+protected:
+    int m_int;
+};
+
+A::A (int i) :
+    m_int(i)
+{
+}
+
+A::A (const A& rhs) :
+    m_int (rhs.m_int)
+{
+}
+
+const A &
+A::operator =(const A& rhs)
+{
+    m_int = rhs.m_int;
+    return *this;
+}
+
+int A::get_int()
+{
+    return m_int;
+}
+
+class B
+{
+public:
+    B () {}
+
+    A AInstance();
+};
+
+A
+B::AInstance()
+{
+    A a(12);
+    return a;
+}
+
+int main (int argc, char const *argv[])
+{
+    B b;
+    int return_val = b.AInstance().get_int();
+
+    A a(b.AInstance());
+    return return_val;
+}