[patch] Hide the stub created for MO_ExternalSymbol too.

[Rafael Espíndola]

I noticed that given

declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1)
declare void @foo()
define void @bar() {
  call void @foo()
  call void @llvm.memset.p0i8.i32(i8* null, i8 0, i32 188, i32 1, i1 false)
  ret void
}

We produce for 32 bit mach-o:

L_foo$stub:
        .indirect_symbol        _foo
        .ascii  "\364\364\364\364\364"

_memset$stub:
        .indirect_symbol        _memset
        .ascii  "\364\364\364\364\364"

I.E., for foo we hide the stub, but for memset we do not. This is
almost certainly a bug since from the linker perspective it shouldn't
matter if the undefined reference was created in LLVM's codegen or
not.

The attached patch fixes it.

Cheers,
Rafael
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