Remove LOAD FRAGMENT

It's very troublesome, with flaky semantics and a very restricted use space.

src/asm/section.c

@@ -427,6 +427,11 @@ void out_SetLoadSection(char const *name, uint32_t type, uint32_t org,
 		return;
 	}
 
+	if (mod == SECTION_FRAGMENT) {
+		error("`LOAD FRAGMENT` is not allowed\n");
+		return;
+	}
+
 	struct Section *sect = getSection(name, type, org, attribs, mod);
 
 	changeSection();

test/asm/load-fragment.asm

@@ -1,29 +1,2 @@
 SECTION "A", ROM0
-AData::
 LOAD FRAGMENT "RAM", WRAM0
-AMem::
-	db 0, 1, 2
-AMemEnd::
-ENDL
-ADataEnd::
-	dw AMem
-
-SECTION "B", ROM0
-BData::
-LOAD FRAGMENT "RAM", WRAM0
-BMem::
-	db 3, 4, 5, 6, 7
-BMemEnd::
-ENDL
-BDataEnd::
-	dw BMem
-
-SECTION "C", ROM0
-CData::
-LOAD FRAGMENT "RAM", WRAM0
-CMem::
-	db 8, 9
-CMemEnd::
-ENDL
-CDataEnd::
-	dw CMem

test/asm/load-fragment.err

@@ -0,0 +1,3 @@
+ERROR: load-fragment.asm(2):
+    `LOAD FRAGMENT` is not allowed
+error: Assembly aborted (1 error)!

test/link/load-fragment-jr.asm

@@ -1,12 +0,0 @@
-SECTION "main", ROM0
-LOAD FRAGMENT "test", SRAM
-ENDL
-
-; The RPN patch for 'jr Label' in section "alt" refers to section "test",
-; but the object file puts section "test" after section "alt".
-; This case needs to be handled when identifying patches' PC sections.
-SECTION "alt", ROM0
-LOAD FRAGMENT "test", SRAM
-	jr Label
-Label:
-ENDL

test/link/load-fragment/a.asm

@@ -1,4 +0,0 @@
-SECTION "main", ROM0
-LOAD FRAGMENT "test", SRAM
-	db 0
-ENDL

test/link/load-fragment/b.asm

@@ -1,6 +0,0 @@
-SECTION "SECTION2", ROM0
-LOAD FRAGMENT "test", SRAM
-	jr Label
-Label:
-	dw Label
-ENDL

test/link/section-fragment/jr-offset-load/a.asm

@@ -1,4 +0,0 @@
-SECTION FRAGMENT "output", ROM0
-LOAD FRAGMENT "loaded", SRAM
-    ds 128
-ENDL

test/link/section-fragment/jr-offset-load/b.asm

@@ -1,6 +0,0 @@
-SECTION FRAGMENT "output", ROM0
-LOAD FRAGMENT "loaded", SRAM
-label:
-	jr nz, label2
-label2:
-ENDL

test/link/test.sh

@@ -130,17 +130,6 @@ rgblinkQuiet -o $gbtemp2 $otemp
 tryCmp $gbtemp $gbtemp2
 rc=$(($? || $rc))
 
-i="load-fragment.asm"
-startTest
-$RGBASM -o $otemp load-fragment/a.asm
-$RGBASM -o $gbtemp2 load-fragment/b.asm
-rgblinkQuiet -o $gbtemp $otemp $gbtemp2 2>$outtemp
-tryDiff load-fragment/out.err $outtemp
-rc=$(($? || $rc))
-dd if=$gbtemp count=1 bs=$(printf %s $(wc -c < load-fragment/out.gb)) > $otemp 2>/dev/null
-tryCmp load-fragment/out.gb $otemp
-rc=$(($? || $rc))
-
 i="overlay.asm"
 startTest
 $RGBASM -o $otemp overlay/a.asm
@@ -160,15 +149,6 @@ dd if=$gbtemp count=1 bs=$(printf %s $(wc -c < section-fragment/jr-offset/ref.ou
 tryCmp section-fragment/jr-offset/ref.out.bin $otemp
 rc=$(($? || $rc))
 
-i="section-fragment/jr-offset-load.asm"
-startTest
-$RGBASM -o $otemp section-fragment/jr-offset-load/a.asm
-$RGBASM -o $gbtemp2 section-fragment/jr-offset-load/b.asm
-rgblinkQuiet -o $gbtemp $otemp $gbtemp2
-dd if=$gbtemp count=1 bs=$(printf %s $(wc -c < section-fragment/jr-offset-load/ref.out.bin)) > $otemp 2>/dev/null
-tryCmp section-fragment/jr-offset-load/ref.out.bin $otemp
-rc=$(($? || $rc))
-
 i="section-union/good.asm"
 startTest
 $RGBASM -o $otemp section-union/good/a.asm