[C++ Patch] PR 82307

[Mukesh Kapoor <mukesh dot kapoor at oracle dot com>]

Hi,

This patch fixes https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82307.
For an unscoped enum with a fixed underlying type, the function 
type_promotes_to() does not always return the same type as the 
underlying type. The fix is to use the underlying type of the enum 
instead of creating a new one by calling c_common_type_for_size().

Bootstrapped and tested with 'make check' on x86_64-linux. New test case 
added.

Mukesh

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