Instantiating the type parameters of a function without calling it fails in LLVM

[paulstansifer]

fn f1[T](int x) {
  log x;
}

fn main() {
  auto f2 = f1[str];
}

results in
rustc: Instructions.cpp:962: void llvm::StoreInst::AssertOK(): Assertion `getOperand(0)->getType() == cast(getOperand(1)->getType())->getElementType() && "Ptr must be a pointer to Val type!"' failed.

[catamorphism]

Dup of Issue #333