re PR target/37033 (Revision 138733 breaks -g vs -g0 for PCH)

gcc/ChangeLog:
PR target/37033
* dwarf2out.c (saved_do_cfi_asm): New.
(dwarf2out_do_frame): Take it into account.
(dwarf2out_d_cfi_asm): Likewise.  Set it when appropriate.
libcpp/ChangeLog:
PR target/37033
* pch.c (cpp_valid_state): Improve message for poisoned symbols.
Allow for differences in __GCC_HAVE_DWARF2_CFI_ASM.

From-SVN: r142652