[Bug default/28641] unspecified indirect subtype changes.

["woodard at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28641

--- Comment #6 from Ben Woodard <woodard at redhat dot com> ---
The functions that I pointed out in the previous comment are all _ZNK
functions. You can overload on the const'ness of a function and so it has to be
encoded in the mangling of the linkage name.

struct X { void foo(); void foo() const; };

We should try to get this fixed in clang so that it correctly encodes the
const'ness of the function in the DWARF. However, we are going to need to deal
with all the versions of clang which don't get this right. So I propose a
fixup: if the function has the K attribute in its name mangling even if the
function's DWARF is not marked const then the function should be labeled as
const.

List of needed actions:
1) file a bug with clang
2) when the difference between two functions is const'ness print that out don't
just leave people with "...has some indirect sub-type changes:" then print
nothing.
3) if the function mangle name has the K in it, then mark it const in the IR.

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