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[cc1] Add debug information to pushctx() and popctx()

This debug information is useful to understand how
the context stack is evoluting in the time.

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -97,6 +97,7 @@

 void

 pushctx(void)

 {

+	DBG("SYM: pushed context %d", curctx+1);

 	if (++curctx == NR_BLOCK+1)

 		error("too many nested blocks");

 }

@@ -131,6 +132,7 @@

 	Symbol *next, *sym;

 	int ns, dangling = 0;

+	DBG("SYM: poped context %d", curctx);

 	/*

 	 * we have to be careful before popping the current

 	 * context, because since the parser is one token