Use single instance of the identical INKERNEL() and PMC_IN_KERNEL()

macros on amd64 and i386.  Move the definition to machine/param.h.
kgdb defines INKERNEL() too, the conflict is resolved by renaming kgdb
version to PINKERNEL().

On i386, correct the lowest kernel address.  After the shared page was
introduced, USRSTACK no longer points to the last user address + 1 [*]

Submitted by:	Oliver Pinter [*]
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

gnu/usr.bin/gdb/kgdb/trgt.c

@@ -76,7 +76,7 @@ kvm_t *kvm;
 static char kvm_err[_POSIX2_LINE_MAX];
 
 #define	KERNOFF		(kgdb_kernbase ())
-#define	INKERNEL(x)	((x) >= KERNOFF)
+#define	PINKERNEL(x)	((x) >= KERNOFF)
 
 static CORE_ADDR
 kgdb_kernbase (void)
@@ -296,7 +296,7 @@ kgdb_set_proc_cmd (char *arg, int from_tty)
 
 	addr = (CORE_ADDR) parse_and_eval_address (arg);
 
-	if (!INKERNEL (addr)) {
+	if (!PINKERNEL (addr)) {
 		thr = kgdb_thr_lookup_pid((int)addr);
 		if (thr == NULL)
 			error ("invalid pid");
@@ -319,7 +319,7 @@ kgdb_set_tid_cmd (char *arg, int from_tty)
 
 	addr = (CORE_ADDR) parse_and_eval_address (arg);
 
-	if (kvm != NULL && INKERNEL (addr)) {
+	if (kvm != NULL && PINKERNEL (addr)) {
 		thr = kgdb_thr_lookup_taddr(addr);
 		if (thr == NULL)
 			error("invalid thread address");