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Print parameters with 'P' letter

this change allows to difference beetween variables and parameters.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -65,6 +65,7 @@

 		bool isregister : 1;

 		bool isdefined : 1;

 		bool isfield : 1;

+		bool isparameter : 1;

 	} s;

 	union {

 		int i;

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -94,6 +94,8 @@

 		c = 'R';

 	else if (sym->s.isfield)

 		c = 'M';

+	else if (sym->s.isparameter)

+		c = 'P';

 	else

 		c = 'A';

 	printf("%c%d", c, sym->id);

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -387,6 +387,7 @@

 	if ((tp = specifier(&sclass)) == voidtype)

 		return tp;

 	sym = declarator(tp, ID_ACCEPTED, NS_IDEN);

+	sym->s.isparameter = 1;

 	tp = sym->type;

 	if (tp->op == FTN)

 		error("incorrect function type for a function parameter");

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -332,8 +332,8 @@

 	}

 end_compound:

-	expect('}');

 	popctx();

+	expect('}');

 	return;

 }