patch: clarify missing template arguments when parsing base specifier

[Nick Lewycky]

We currently just emit "expected class name" if the base specifier names a
template-id without a template argument list. This patch changes that error
to say "expected template argument list after template-id". Fixes PR8382!
Please review.

There is a secondary side-effect with the interaction with typo correction
which is partly undesirable (too verbose) and partly better (typo
correction is performed). On this testcase:

template <typename T> class Foo {}; class Bar : public Foox {};

before my patch, clang emits:

a.cc:1:56: error: expected class name
[point at 'Foox']

and with my patch clang emits:

a.cc:1:56: error: no template named 'Foox'; did you mean 'Foo'?
template <typename T> class Foo {}; class Bar : public Foox {};
[point at 'Foox' suggest 'Foo']
a.cc:1:29: note: 'Foo' declared here
template <typename T> class Foo {}; class Bar : public Foox {};
[point at 'Foo']
a.cc:1:56: error: expected template argument list after template-id
template <typename T> class Foo {}; class Bar : public Foox {};
[point at 'Foox']

Nick
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