Add test case related to variable shadowing

tests/regression/test-shadowing/Makefile

+include ../shared.mk
+
+all: test-ada test-llvm
+
+edit:
+	$(OPENGEODE) og.pr
+
+test-parse:
+	$(OPENGEODE) og.pr --check
+
+test-ada: 
+	$(OPENGEODE) og.pr --toAda
+	mono $(ASN1SCC) -Ada -typePrefix asn1Scc -equal dataview-uniq.asn 
+	$(GNATMAKE) -O$(O) -c *.adb
+	$(GNATBIND) -n og.ali
+
+test-c: 
+	$(OPENGEODE) og.pr --toC
+	mono $(ASN1SCC) -c -typePrefix asn1Scc -equal dataview-uniq.asn 
+	$(CC) -O$(O) -c *.c
+
+
+test-llvm:
+	$(OPENGEODE) og.pr --llvm -O$(O)
+	$(LLC) *.ll
+	$(CC) -O$(O) -c *.s
+
+
+coverage:
+	coverage run -p $(OPENGEODE) og.pr --toAda
+
+.PHONY: all edit test-parse test-ada test-llvm coverage

tests/regression/test-shadowing/dataview-uniq.asn

+TASTE-Dataview DEFINITIONS ::=
+
+
+BEGIN
+
+MyChoice ::= CHOICE {
+    a CHOICE {
+        b CHOICE {
+            c BOOLEAN,
+            d BOOLEAN
+        },
+        e BOOLEAN
+    },
+    f BOOLEAN
+}
+
+Some-Thing ::= MyInteger
+
+MyInteger   ::= INTEGER (0..255)
+
+My-OctStr    ::= OCTET STRING (SIZE (0..20))
+
+SeqOf ::= SEQUENCE (SIZE(0..100)) OF MyInteger
+
+Type1 ::= INTEGER(0..1)
+Type2 ::= BOOLEAN
+
+Toto ::= SEQUENCE { elem-1 Type1, elem-2 Type2 }
+
+SeqBool ::= SEQUENCE(SIZE(1..5)) OF BOOLEAN
+Enum ::= ENUMERATED {enum1}
+
+default-seqof SeqOf ::= {4,7,9}
+default-str My-OctStr ::= 'DEADBEEF'H
+
+END

tests/regression/test-shadowing/og.pr

+SYSTEM og;
+    /* CIF TEXT (159, 221), (287, 188) */
+    -- Text area for declarations and comments
+
+use dv comment 'dataview-uniq.asn';
+
+--use dv2 comment 'dataview2.asn';
+
+signal dd(Type2);
+signal we(Some_Thing);
+
+procedure hehe;
+fpar in/out a_param Type2;
+external;
+    /* CIF ENDTEXT */
+    CHANNEL c
+        FROM ENV TO og WITH dd;
+        FROM og TO ENV WITH we;
+    ENDCHANNEL;
+    BLOCK og;
+        SIGNALROUTE r
+            FROM ENV TO og WITH dd;
+            FROM og TO ENV WITH we;
+        CONNECT c AND r;
+        /* CIF PROCESS (225, 49), (150, 75) */
+        PROCESS og;
+            /* CIF TEXT (57, 58), (287, 140) */
+            -- Text area for declarations and comments
+
+dcl haha SeqOf;
+
+dcl hihi type2;
+
+dcl test Some_Thing := 4;
+            /* CIF ENDTEXT */
+            /* CIF PROCEDURE (404, 228), (73, 35) */
+            PROCEDURE aProc;
+                /* CIF TEXT (542, 127), (287, 140) */
+                dcl  tmp Some_Thing := 1;
+                /* CIF ENDTEXT */
+                /* CIF START (164, 113), (70, 35) */
+                START;
+                    /* CIF OUTPUT (154, 163), (89, 35) */
+                    OUTPUT we(test);
+                    /* CIF OUTPUT (155, 213), (88, 35) */
+                    OUTPUT we(tmp)
+                    /* CIF COMMENT (263, 213), (269, 35) */
+                    COMMENT 'check that local variables can be sent';
+                    /* CIF RETURN (181, 263), (35, 35) */
+                    RETURN ;
+            ENDPROCEDURE;
+            /* CIF PROCEDURE (439, 309), (70, 35) */
+            PROCEDURE haha
+            /* CIF COMMENT (529, 309), (184, 35) */
+            COMMENT 'same name as a variable';
+            ENDPROCEDURE;
+            /* CIF PROCEDURE (414, 353), (124, 35) */
+            PROCEDURE default_seqof
+            /* CIF COMMENT (558, 353), (189, 35) */
+            COMMENT 'same name as a constant';
+            ENDPROCEDURE;
+            /* CIF PROCEDURE (430, 404), (78, 35) */
+            PROCEDURE enum1
+            /* CIF COMMENT (528, 404), (206, 35) */
+            COMMENT 'same name as an enum item';
+            ENDPROCEDURE;
+            /* CIF START (155, 216), (70, 35) */
+            START;
+                /* CIF NEXTSTATE (155, 266), (70, 35) */
+                NEXTSTATE wait;
+            /* CIF STATE (296, 231), (70, 35) */
+            STATE wait;
+                /* CIF INPUT (289, 286), (84, 35) */
+                INPUT dd(hihi);
+                    /* CIF PROCEDURECALL (281, 336), (100, 35) */
+                    CALL hehe(hihi);
+                    /* CIF OUTPUT (286, 386), (89, 35) */
+                    OUTPUT we(test);
+                    /* CIF PROCEDURECALL (296, 436), (70, 35) */
+                    CALL haha;
+                    /* CIF PROCEDURECALL (269, 486), (124, 35) */
+                    CALL default_seqof;
+                    /* CIF PROCEDURECALL (292, 536), (78, 35) */
+                    CALL enum1;
+                    /* CIF NEXTSTATE (296, 586), (70, 35) */
+                    NEXTSTATE wait;
+            ENDSTATE;
+        ENDPROCESS og;
+    ENDBLOCK;
+ENDSYSTEM;
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