Patch: [z80] solve PR gas/12269

[Arnold Metselaar]

Hello,

I have applied the attached patch to solve bug 12269. 
The ChangeLog entry is below.
Maybe the fix should go into the 2.21 branch as well.

Arnold

gas/ChangeLog:
	PR gas/12269
	* config/tc-z80.c (emit_mx, emit_ldxhl): Do not use
	symbol_get_value_expression on a symbol that may not yet have
	a value.
	* testsuite/gas/z80/atend.s: New file, test case for bug 12269,
	provided by Chris Smith.
	* testsuite/gas/z80/atend.d: New file, expected results for atend.s.
	* testsuite/gas/z80/z80.exp: Run new test case.
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