(ASM_FILE_START): If profiling IMPORT "_mcount" instead of

(ASM_FILE_START): If profiling IMPORT "_mcount" instead of
"__gcc_mcount".

(TARGET_SWITCHES): New switch "no-bss" which forces gcc not
use make use of the bss subspace.  (For compatability with old
buggy versions of gas.)
(ASM_FILE_START): Add $BSS$ subspace.
(BSS_SECTION_ASM_OP): New macro which tells the assembler to
switch to the bss subspace.
(EXTRA_SECTIONS): Define in_bss as an extra section.
(EXTRA_SECTION_FUNCTIONS): Define "bss_section" function to switch
into the bss subspace.
(ASM_OUTPUT_COMMON): If !TARGET_NO_BSS, then place commons into
the bss subspace.
(ASM_OUTPUT_LOCAL): Likewise.

From-SVN: r1775