remove non standard instructions do testing outside of repo

bit.asm

@@ -1,13 +1,3 @@
-mov r1, 0
-qcall clz
-add zr, zr, zr
-mov r1, 0x1
-qcall clz
-add zr, zr, zr
-add r1, zr, 0xAAAA
-lsl r1, r1, 6
-qcall popc
-
 pub rotate_left:
 	; (r1 >> r2) | (r1 << (32 - r2))
 	sub r3, zr, r2

imath.asm

@@ -0,0 +1,16 @@
+pub mul_low:
+	mov r3, 0 ; result
+	mov r4, 31 ; loop counter
+	
+	mull_loop:
+		asr r5, r2, 31
+		and r5, r5, r1
+		lsl r5, r5, r4
+		add r3, r3, r5
+		lsl r2, r2, 1
+		sub r4, r4, 1
+		cmp r4, 0
+		jge mull_loop
+	mov r1, r3
+	
+	jmp r13

stdlib.asm

@@ -28,3 +28,4 @@
 ; ===== TYPES =====
 
 pub include bit
+pub include imath