[cxx-abi-dev] <prefix> mangling and substitutions

[Richard Smith]

We have:

<prefix> ::= # empty
::= <substitution>

This implies that we generate a substitution for an empty prefix (and then
use that as the base of every subsequent prefix that doesn't start with a
<template-param> or <decltype>). This seems wrong to me, and doesn't match
current implementation practice.

One possible fix: replace "# empty" with "<unqualified-name>", and add
"<template unqualified-name>" to the productions for <template-prefix>.
This would also remove the ambiguity as to whether ::x is 1x or N1xE.

Thoughts?
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