* flags.h (flag_dump_rtl_in_asm): Declare.
* toplev.c (flag_dump_rtl_in_asm): Define.
(decode_d_option): Set flag_dump_rtl_in_asm and flag_print_asm_name
if -dP is specified.
* rtl.h (print_rtx_head): Declare.
* print-rtl.c (print_rtx_head): Define.
(print_rtx): Print the string pointed to by print_rtx_head
at beginning of each dump line.
(print_rtl): Likewise.
(print_rtl_single): Likewise.
* final.c (final_scan_insn): Dump the insn in the assembly
file for debugging.
* gcc.1: Document -dP option.
* invoke.texi (Debugging Options): Likewise.
From-SVN: r36394
