[1/11][Clang][Type] Expand BuiltinTypeBits from 8 to 9 bits

This patch-set aims to expand all variants of the RVV segment
load/store intrinsics. The first commit expands the limitation of
builtin types from 256 to 512. The following patches expands the
full variants one-by-one.

The next patch introduces a number of new RVV tuple types and lets the
total of builtin types exceed the current limit (256). This patch
attempts to increase the bits used so we can continue to expand new
builtin types.

Reviewed By: erichkeane

Differential Revision: https://reviews.llvm.org/D152069