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[cc1] Allow TYPEIDEN in cast

This enables casts to typedef types.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -877,6 +877,7 @@

 	switch (yytoken) {

 	case TQUALIFIER:

 	case TYPE:

+	case TYPEIDEN:

 		tp = typename();

 		expect(')');

--- /dev/null

+++ b/tests/execute/0110-typedefcast.c

@@ -1,0 +1,2 @@

+typedef int myint;

+myint x = (myint)1;

--- a/tests/execute/scc-tests.lst

+++ b/tests/execute/scc-tests.lst

@@ -100,3 +100,4 @@

 0107-bnot.c

 0108-bug.c

 0109-struct.c

+0110-typedefcast.c