Quick fix for high resolution kernel profiling on i386's. Use

-finstrument-functions instead of -mprofiler-epilogue.  The former
works essentially the same as the latter but has a higher overhead
(about 22 more bytes per function for passing unused args to the
profiling functions).

Removed all traces of the IDENT Makefile variable, which had been
reduced to just a place for holding profiling's contribution to CFLAGS
(the IDENT that gives the kernel identity was renamed to KERN_IDENT).

sys/amd64/amd64/prof_machdep.c

@@ -94,6 +94,8 @@ __mcount:							\n\
  	.p2align 4,0x90						\n\
  	.globl	" __XSTRING(HIDENAME(mcount)) "			\n\
 " __XSTRING(HIDENAME(mcount)) ":				\n\
+ 	.globl	__cyg_profile_func_enter			\n\
+__cyg_profile_func_enter:					\n\
 	cmpl	$GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 	je	.mcount_exit					\n\
 	#							\n\
@@ -147,6 +149,8 @@ GMON_PROF_HIRES	=	4					\n\
 	.p2align 4,0x90						\n\
 	.globl	" __XSTRING(HIDENAME(mexitcount)) "		\n\
 " __XSTRING(HIDENAME(mexitcount)) ":				\n\
+ 	.globl	__cyg_profile_func_exit				\n\
+__cyg_profile_func_exit:					\n\
 	cmpl	$GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 	jne	.mexitcount_exit				\n\
 	pushl	%edx						\n\

sys/conf/kern.post.mk

@@ -224,7 +224,7 @@ hints.o:	hints.c
 	${NORMAL_C}
 
 vers.c: $S/conf/newvers.sh $S/sys/param.h ${SYSTEM_DEP}
-	sh $S/conf/newvers.sh ${KERN_IDENT} ${IDENT}
+	sh $S/conf/newvers.sh ${KERN_IDENT}
 
 # XXX strictly, everything depends on Makefile because changes to ${PROF}
 # only appear there, but we don't handle that.

sys/conf/kern.pre.mk

@@ -38,7 +38,7 @@ INCLUDES+= -I$S/../include
 INCLUDES+= -I/usr/include
 .endif
 
-COPTS=	${INCLUDES} ${IDENT} -D_KERNEL -include opt_global.h
+COPTS=	${INCLUDES} -D_KERNEL -include opt_global.h
 CFLAGS=	${COPTFLAGS} ${CWARNFLAGS} ${DEBUG} ${COPTS} -fno-common
 
 # XXX LOCORE means "don't declare C stuff" not "for locore.s".
@@ -50,18 +50,16 @@ ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${CFLAGS}
 CFLAGS+=	${FMT}
 
 .if defined(PROFLEVEL) && ${PROFLEVEL} >= 1
-IDENT=	-DGPROF
+CFLAGS+=	-DGPROF -falign-functions=16
+.if ${PROFLEVEL} >= 2
+CFLAGS+=	-DGPROF4 -DGUPROF
+# XXX -Wno-inline is to break some warnings.
+PROF=	-finstrument-functions -Wno-inline
+.else
 PROF=	-pg
 .endif
-
+.endif
 DEFINED_PROF=	${PROF}
-.if defined(PROF)
-CFLAGS+=	-falign-functions=16
-.if ${PROFLEVEL} >= 2
-IDENT+=	-DGPROF4 -DGUPROF
-PROF+=	-mprofiler-epilogue
-.endif
-.endif
 
 .if defined(NO_WERROR)
 WERROR=

sys/i386/isa/prof_machdep.c

@@ -94,6 +94,8 @@ __mcount:							\n\
  	.p2align 4,0x90						\n\
  	.globl	" __XSTRING(HIDENAME(mcount)) "			\n\
 " __XSTRING(HIDENAME(mcount)) ":				\n\
+ 	.globl	__cyg_profile_func_enter			\n\
+__cyg_profile_func_enter:					\n\
 	cmpl	$GMON_PROF_OFF," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 	je	.mcount_exit					\n\
 	#							\n\
@@ -147,6 +149,8 @@ GMON_PROF_HIRES	=	4					\n\
 	.p2align 4,0x90						\n\
 	.globl	" __XSTRING(HIDENAME(mexitcount)) "		\n\
 " __XSTRING(HIDENAME(mexitcount)) ":				\n\
+ 	.globl	__cyg_profile_func_exit				\n\
+__cyg_profile_func_exit:					\n\
 	cmpl	$GMON_PROF_HIRES," __XSTRING(CNAME(_gmonparam)) "+GM_STATE \n\
 	jne	.mexitcount_exit				\n\
 	pushl	%edx						\n\