Why does LLVM-bit code have duplicate characters for constructors?

Question

Consider the following files

foo.h

class Foo
{
  Foo();
  Foo(int x);
  void bar();
}

foo.cc

# include foo.h

Foo::Foo() {}
Foo::Foo(int x) {}
void Foo::bar() {}

When compiling these files in LLVM bit foo.bcas follows

clang++ -c -o foo.bc -emit-llvm foo.cc

the resulting LLVM bitcode foo.bccontains two characters for each constructor definition, but only one character for the function definition. Why is this?

I tested this on both versions of LLVM versions 3.4 and 4.0.1, and the behavior occurs in both versions. For reference, here is the conclusion

llvm-nm foo.bc

T _ZN3Foo3barEv
T _ZN3FooC1Ei
T _ZN3FooC1Ev
T _ZN3FooC2Ei
T _ZN3FooC2Ev

- Change -

Based on the milleniumbug comment below, there is more information about object constructors here: