dwt/loader: COFF loader places GSPLNK images and runs them via create_process

dwt/loader/rel_a.asm

@@ -0,0 +1,12 @@
+; rel_a.asm -- reldemo caller: has a 32-bit data reference and an absolute call
+; to a symbol defined in rel_b.asm.
+	.def	_start
+	.ref	ext_func
+	.ref	ext_data
+	.text
+_start:
+	movi	ext_data, a0, L		; 32-bit direct reference (R-RELLONG)
+	move	a0, @018F0000h, 1	; fixed marker (not a relocation)
+	calla	ext_func			; 32-bit absolute call
+	rets
+	.end