Under unusual circumstances (jitting a function that causes the creation of

another stub, but then never calling the jitted function) can cause the JIT to
leave a stub in place. Judging by the comments this is a known deficiency, so
we're just not going to use AssertingVH for the StubToFunctionTy map.

Also shorten some lines longer than 80 columns.

This fixes the "make check" failure with ocaml on x86-64 linux.

llvm-svn: 70185