[BOLT] Fix C++ exceptions for shared objects

Summary:
Fix several issues to make C++ exceptions work in shared objects:
  * Set MCObjectFileInfo PIC type based on the input binary type.
  * Support indirect (DW_EH_PE_indirect) encoding while writing
    exception Type Table.
  * Use different LPStart value and landing pad encoding for .so's.
  * Disable splitting of exception-handling code for .so's because of
    the new encoding.

(cherry picked from FBD24698765)