ctf-reader: Fix size and name for underlying types

ctf-reader: Fix size and name for underlying types

This patch fixes an incorrect representation in size and name of the
underlying type of enums as well as underlying types of bitfield data
members types.

For instance, consider this struct.

    struct foo
    {
      unsigned bar : 2;
      unsigned baz : 1;
    };

The data members bar and baz have an underlying type that is "unsigned
int".  Yet, the CTF front-end represents the underlying type of these
data members as:

  <type-decl name='' is-anonymous='yes' size-in-bits='2' id='type-id-1'/>

The name property is empty, and it should be "unsigned int".

The size in bit is '2', but it should be the size of the underlying
"unsigned int", in bits, which is 32.

In other words, the underlying type of bar and baz should be:

  <type-decl name='unsigned int' size-in-bits='32' id='type-id-4'/>

Note that today, libabigail doesn't represent the bitfield properties
of the data member.  Those bitfield properties are properties of the
data member, not of their type.  This is a known "Not Yet Implemented"
feature request that has been filed upstream at
https://sourceware.org/bugzilla/show_bug.cgi?id=27334.

Similarly, the underlying type of enums is not properly represented by
the CTF front-end.

Fixed thus.

	* src/abg-ctf-reader.cc (process_ctf_{base_type,enum_type}):
	Look at ctf refence type to build the underlying type if present.
	* tests/data/Makefile.am: New test cases.
	* tests/data/test-read-ctf/PR27700/test-PR27700.abi: New test input.
	* tests/data/test-read-ctf/test-bitfield-enum.abi: Likewise.
	* tests/data/test-read-ctf/test-bitfield-enum.c: Likewise.
	* tests/data/test-read-ctf/test-bitfield-enum.o: Likewise.
	* tests/data/test-read-ctf/test-bitfield.abi: Likewise.
	* tests/data/test-read-ctf/test-bitfield.c: Likewise.
	* tests/data/test-read-ctf/test-bitfield.o: Likewise.
	* tests/data/test-read-ctf/test-enum-many.o.hash.abi: Adjust.
	* tests/data/test-read-ctf/test-enum-symbol.o.hash.abi: Likewise.
	* tests/data/test-read-ctf/test-enum.o.abi: Likewise:
	* tests/data/test-read-ctf/test0.abi: Likewise.
	* tests/data/test-read-ctf/test0.hash.abi: Likewise.
	* tests/data/test-read-ctf/test1.so.abi: Likewise.
	* tests/data/test-read-ctf/test1.so.hash.abi: Likewise.
	* tests/data/test-read-ctf/test5.o.abi: Likewise.
	* tests/test-read-ctf.cc: Update test suite.

Signed-off-by: Guillermo E. Martinez <guillermo.e.martinez@oracle.com>
Signed-off-by: Dodji Seketeli <dodji@redhat.com>