Fix jit.dg/test-alignment* (PR jit/82846)

These testcases jit-compile functions that return char, but
were erroneously calling them as if they returned int.

This led to errors for certain target configurations (e.g.
reading from %eax (32-bit) in the harness when only %al (8-bit)
had been written to in the jit-compiled function).

gcc/testsuite/ChangeLog:
	PR jit/82846
	* jit.dg/test-alignment.c (create_aligned_code): Fix return type
	of "fn_type" typedef.
	* jit.dg/test-alignment.cc (verify_aligned_code): Likewise.

From-SVN: r257037

gcc/testsuite/ChangeLog

+2018-01-24  David Malcolm  <dmalcolm@redhat.com>
+
+	PR jit/82846
+	* jit.dg/test-alignment.c (create_aligned_code): Fix return type
+	of "fn_type" typedef.
+	* jit.dg/test-alignment.cc (verify_aligned_code): Likewise.
+
 2018-01-24  Ian Lance Taylor  <iant@golang.org>
 
 	* go.go-torture/execute/names-1.go: New test.

gcc/testsuite/jit.dg/test-alignment.c

@@ -166,7 +166,7 @@ create_aligned_code (gcc_jit_context *ctxt, const char *struct_name,
 				   gcc_jit_result *result,		\
 				   const char *writer_fn_name)		\
   {									\
-  typedef int (*fn_type) (struct TYPENAME *);				\
+  typedef char (*fn_type) (struct TYPENAME *);				\
   CHECK_NON_NULL (result);						\
 									\
   struct TYPENAME tmp;							\

gcc/testsuite/jit.dg/test-alignment.cc

@@ -126,7 +126,7 @@ verify_aligned_code (gcc_jit_context *ctxt,
                      gcc_jit_result *result,
                      const char *writer_fn_name)
 {
-  typedef int (*fn_type) (T *);
+  typedef char (*fn_type) (T *);
   CHECK_NON_NULL (result);
 
   T tmp;