MFC: Add the tl_trap_*() and t1_text_*() symbols to unbreak the build.

The changes in rev 1.25 of db_trace.c to use these symbols was MFC'd
earlier.

Approved by:	re (scottl)

sys/sparc64/sparc64/exception.S

@@ -166,6 +166,10 @@ __FBSDID("$FreeBSD$");
 	ldx	[ASP_REG + 0], %g1 ; \
 	inc	16, ASP_REG
 
+	.globl	tl_text_begin
+tl_text_begin:
+	nop
+
 ENTRY(tl1_kstack_fault)
 	rdpr	%tl, %g1
 1:	cmp	%g1, 2
@@ -1818,6 +1822,10 @@ END(tl1_spill_topcb)
 	.endm
 
 	.sect	.trap
+	.globl	tl_trap_begin
+tl_trap_begin:
+	nop
+
 	.align	0x8000
 	.globl	tl0_base
 
@@ -2015,6 +2023,10 @@ tl1_breakpoint:
 	tl1_gen		T_RSTRWP_VIRT			! 0x303
 	tl1_reserved	252				! 0x304-0x3ff
 
+	.globl	tl_trap_end
+tl_trap_end:
+	nop
+
 /*
  * User trap entry point.
  *
@@ -2901,6 +2913,10 @@ ENTRY(tl1_intr)
 	retry
 END(tl1_intr)
 
+	.globl	tl_text_end
+tl_text_end:
+	nop
+
 /*
  * Freshly forked processes come here when switched to for the first time.
  * The arguments to fork_exit() have been setup in the locals, we must move