Revert "[lldb/DWARF] Use DW_AT_call_pc to determine artificial frame address"

This reverts commit 6905394d. The
changed test is failing on Debian/x86_64, possibly because lldb is
subtracting an offset from the DW_AT_call_pc address used for the
artificial frame:

http://lab.llvm.org:8011/builders/lldb-x86_64-debian/builds/7171/steps/test/logs/stdio

/home/worker/lldb-x86_64-debian/lldb-x86_64-debian/llvm-project/lldb/test/API/functionalities/tail_call_frames/unambiguous_sequence/main.cpp:6:17: error: CHECK-NEXT: expected string not found in input
 // CHECK-NEXT: frame #1: 0x{{[0-9a-f]+}} a.out`func3() at main.cpp:14:3 [opt] [artificial]
                ^
<stdin>:3:2: note: scanning from here
 frame #1: 0x0000000000401127 a.out`func3() at main.cpp:13:4 [opt] [artificial]