Replace std::vector with llvm::SmallVector in gen/runtime.cpp.

The vector arrays for the parameter lists are a perfect fit for
llvm::SmallVector: the vector size is small and known in advance.
Merge pull request #271 from redstar/runtime

Replace std::vector with llvm::SmallVector in gen/runtime.cpp.
Replace std::vector with llvm::SmallVector in gen/tollvm.cpp.
Merge pull request #272 from redstar/tollvm

Replace std::vector with llvm::SmallVector and C arrays in gen/tollvm.cpp.
Merge branch 'master' into merge-2.061-2

Conflicts:
	gen/runtime.cpp