fix(asm): bound the data section to what the image can materialise

Assisted-by: GLM 5.3 Flash

asm/assembler_fuzz_test.go

@@ -82,7 +82,9 @@ func FuzzAssembleAMD64(f *testing.F) {
 	// above never reach.
 	f.Add("TEXT ·f(SB), $0\n\tBOGUSINSTR AX, BX\n\tRET\n")
 	f.Add("GLOBL d(SB), $-8\n")
+	f.Add("GLOBL d(SB), $-1\n")
 	f.Add("GLOBL d(SB), $0x7FFFFFFFFFFFFFFF\n")
+	f.Add("GLOBL d(SB), $0x4000000\nDATA e+0(SB)/8, $1\nGLOBL e(SB), $0x4000000\nDATA f+0(SB)/8, $1\nGLOBL f(SB), $0x4000000\n")
 	f.Add("DATA d+0(SB)/9, $1\nGLOBL d(SB), $8\n")
 	f.Add("TEXT ·f(SB), NOSPLIT, $0\n\tADJSP $16\n\tRET\n")
 	f.Add("#define A A\nA\n")