[BOLT][Refactoring] Make CTC first class operand, etc.

Summary:
This diff is a preparation for decoupling function disassembly,
profile association, and CFG construction phases.

We used to have multiple ways to mark conditional tail calls with
annotations or TailCallOffsets map. Since CTC information is affecting
the correctness, it is justifiable to have it as a operand class for
instruction with a destination (0 is a valid one).

"Offset" annotation now replaces "EdgeCountData" and
"IndirectBranchData" annotations to extract profile data for any
given instruction.

Inlining for small functions was broken in a presence of
profiled (annotated) instructions and hence I had to remove
"-inline-small-functions" from the test case.

Also fix an issue with UNDEF section for created __hot_start/__hot_end
symbols. Now the symbols use ABS section.

(cherry picked from FBD6087284)