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[cc1] Add tests about incomplete arrays in test034.c

These tests are really interesting because they tests
that declaration of arrays of incomplete type in the
external scope are allowed and there are not problems
related to the fact of redefinition of them with
the complete type.

--- a/cc1/tests/test034.c

+++ b/cc1/tests/test034.c

@@ -2,27 +2,40 @@

 /*

 name: TEST034

-description: Basic test for incomplete structures

+description: Basic test for incomplete types

 error:

-test034.c:46: error: declared variable 'bar' of incomplete type

-test034.c:46: error: redeclaration of 'bar'

+test034.c:59: error: declared variable 'bar' of incomplete type

+test034.c:59: error: redeclaration of 'bar'

 output:

-X3	S2	"x

-X5	I	F	"foo

-G6	I	F	"main

+G2	V1	"v

+V3	I	#N10

+G2	V3	"v

+Y4	V1	"p

+Y4	V3	"p

+X7	S6	"x

+X9	I	F	"foo

+G10	I	F	"main

 {

 \

-X7	S2	"x

-	h	X7	'P	#P0	!I

+X11	S6	"x

+	h	X11	'P	#P0	!I

 }

-G5	I	F	"foo

+G9	I	F	"foo

 {

 \

-	X3	M9	.I	#I0	:I

-	h	X3	M9	.I

+	X7	M13	.I	#I0	:I

+	h	X7	M13	.I

 }

-X13	S11	"bar2

+X17	S15	"bar2

 */

+

+int v[];

+int v[10];

+static int p[];

+static int p[10];

+static int p[10];

+int v[10];

+int v[];

 extern struct X x;

 int foo();