This patch allows the use of__vector_quad and __vector_pair, PPC MMA builtin
types, on all PowerPC 64-bit compilation units. When these types are
made available the builtins that use them automatically become available
so semantic checking for mma and pair vector memop __builtins is also
expanded to ensure these builtin function call are only allowed on
Power10 and new architectures. All related test cases are updated to
ensure test coverage.