Speed up Function::isIntrinsic() by adding a bit to GlobalValue. NFC

Summary:
Previously isIntrinsic() called getName().  This involves a hashtable
lookup, so is nontrivially expensive.  And isIntrinsic() is called
frequently, particularly by dyn_cast<IntrinsicInstr>.

This patch steals a bit of IntID and uses that to store whether or not
getName() starts with "llvm."

Reviewers: bogner, arsenm, joker-eph

Subscribers: sanjoy, llvm-commits

Differential Revision: https://reviews.llvm.org/D22949

llvm-svn: 290691