More mangling issues

[Martin von Loewis]

I found a number of new problems with mangling: The compression scheme
mentions the order of type recording qualifiers and templates; a
similar mechanism probably applies to:

- function types
- array types
- pointer-to-member types

E.g. a for an array type, the array is less recent than the element
type.

Another issue: for pointer-to-member types, is the M qualifier already
pointer in itself? I.e. given

  _Z3fooPM2ABi

Is this foo(int AB::*) or foo(int AB::**)? Same for functions, which
leads to the question what _Z3fooPPM2ABFiE is.

Martin