re PR go/61498 (Many 64-bit Go tests SEGV in scanblock)

	PR go/61498
runtime: Always set gcnext_sp to pointer-aligned address.

The gcnext_sp field is only used on systems that do not use
split stacks.  It marks the bottom of the stack for the
garbage collector.  This change makes sure that the stack
bottom is always aligned to a pointer value.

Previously the garbage collector would align all the addresses
that it scanned, but it now expects them to be aligned before
scanning.

From-SVN: r211639

libgo/runtime/proc.c

@@ -255,9 +255,6 @@ runtime_mcall(void (*pfn)(G*))
 {
 	M *mp;
 	G *gp;
-#ifndef USING_SPLIT_STACK
-	int i;
-#endif
 
 	// Ensure that all registers are on the stack for the garbage
 	// collector.
@@ -273,7 +270,7 @@ runtime_mcall(void (*pfn)(G*))
 #ifdef USING_SPLIT_STACK
 		__splitstack_getcontext(&g->stack_context[0]);
 #else
-		gp->gcnext_sp = &i;
+		gp->gcnext_sp = &pfn;
 #endif
 		gp->fromgogo = false;
 		getcontext(&gp->context);
@@ -1933,7 +1930,7 @@ doentersyscall()
 				       &g->gcinitial_sp);
 #else
 	{
-		uint32 v;
+		void *v;
 
 		g->gcnext_sp = (byte *) &v;
 	}