[patch][gas/testsuite] Avoid name conflicts with z80 registers

[Arnold Metselaar]

The z80 port of the assembler no longer accepts register names as ordinary symbols. 
This causes some test cases with  single letter identifiers like a,b,c to fail for z80. 

May I apply the attached patch with the following ChangeLog entry?

Arnold

gas/testsuite/ChangeLog: 
	* gas/all/cond.s: Add L_ as prefix to one-letter symbols, to avoid name conflicts with z80 registers.
	* gas/all/fwdexp.s: Likewise
	* gas/macros/app1.s: Likewise
	* gas/macros/app2.s: Likewise
	* gas/macros/app3.s: Likewise
	* gas/macros/app4.s: Likewise
	* gas/macros/app4b.s: Likewise
	* gas/all/cond.l: Adapted to expect L_ prefixes.
	* gas/all/fwdexp.d: Likewise
	* gas/macros/app1.d: Likewise
	* gas/macros/app2.d: Likewise
	* gas/macros/app3.d: Likewise
	* gas/macros/app4.d: Likewise
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