fix JUMP with immediate offsets (should get converted to words)

Offsets specified as immediate values are given in bytes but the
underlying machine instruction needs a word offset. Thus, we need
to convert immediate values to words by dividing by 4.

This commit contributes to being able to eventually assemble the
esp32ulp_all.s test from binutils-esp32ulp. It addresses this line:
https://github.com/espressif/binutils-esp32ulp/blob/249ec34cc2c9574a86f3f86bbb175a863f988bcf/gas/testsuite/gas/esp32ulp/esp32/esp32ulp_all.s#L109

Author: wnienhaus

esp32_ulp/opcodes.py

@@ -619,7 +619,7 @@ def i_jump(target, condition='--'):
         raise ValueError("invalid flags condition")
     if target.type == IMM or target.type == SYM:
         _bx.dreg = 0
-        _bx.addr = get_abs(target)
+        _bx.addr = get_abs(target) if target.type == SYM else get_abs(target) >> 2  # bitwise version of "// 4"
         _bx.unused = 0
         _bx.reg = 0
         _bx.type = jump_type

tests/compat/jumps.S

@@ -5,6 +5,12 @@
 entry:
   nop
 
+  # simple jumps
+  jump entry
+  jump later
+  jump 0x120, EQ
+  jump -288, EQ
+
   # jumps with labels
   jumps entry, 42, lt
   jumps entry, 42, lt