Fix gccjit/gccjit.c concat_expr_and_scope() to suppress function header/footer for -r|-raw.
Fix gccjit/gccjit.c eval_gcc_jit_command() EXPR_PC calculation.
Fix gccjit/loc2c.c DW_OP_fbreg to no longer ignore the associated offset.
Change gccjit/gccjit.c eval_gcc_jit_command() for the new JIT module disposal scheme.

Split out gccjit/gdbjit-run.[ch] out of gccjit/gdbjit-load.[ch].
Add call_function_by_hand_dummy() with new dummy frame destructor callback:
  Add to struct dummy_frame: register_dummy_frame_dtor(), find_dummy_frame_dtor()
Add gdbjit_register_name_demangle() besides current gdbjit_register_name_mangled().
Support inferior registers passing.