[PATCH] Consider only implicit builtin functions as device host in SemaCUDA

[Jacques Pienaar]

Hi rnk, eliben,

In SemaCUDA all implicit functions were considered device host, this led to errors such as the following code snippet failing to compile:
```
struct Copyable {
  const Copyable& operator=(const Copyable& x) { return *this; }
};

struct Simple {
  Copyable b;
};

void foo() {
  Simple a, b;

  a = b;
}
```
Above the implicit copy assignment operator was inferred as host device but there was only a host assignment copy defined which is an error in device compilation mode.

http://reviews.llvm.org/D6565

Files:
  lib/Sema/SemaCUDA.cpp
  test/SemaCUDA/implicit-copy.cu
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