Eliminate dependency on -fsource-location
-fsource-location placed a trace_stment() call before the start of the generated C for every COBOL instruction. This was needed to make the .loc assembly directives work. Simon replaced those calls with "call cob_nop()". I get rid of them, except when the following .loc statement has "discriminator" in it. Otherwise the code doesn't trap properly through some loops. I have no idea why.
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