Extend find_data_type_die() to find data type from PC-relative address
using die_find_variable_by_addr().  Users need to pass the address for
the (global) variable.

The offset for the variable should be updated after finding the type
because the offset in the instruction is just to calcuate the address
for the variable.  So it changed to pass a pointer to offset and renamed
it to 'poffset'.

First it searches variables in the CU DIE as it's likely that the global
variables are defined in the file level.  And then it iterates the scope
DIEs to find a local (static) variable.
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20240117062657.985479-6-namhyung@kernel.orgSigned-off-by: Namhyung Kim <namhyung@kernel.org>