[PATCH (for next stage 1)] Add return type to gimple function dumps

[David Malcolm]

Gimple function dumps contain the types of parameters, but not of the
return type.

The attached patch fixes this omission; here's an example of the
before/after diff:
$ diff -up /tmp/pr23401.c.004t.gimple.old /tmp/pr23401.c.004t.gimple.new
--- /tmp/pr23401.c.004t.gimple.old      2014-03-10 13:40:08.972063541 -0400
+++ /tmp/pr23401.c.004t.gimple.new      2014-03-10 13:39:49.346515464 -0400
@@ -1,3 +1,4 @@
+int
 ffff (int i)
 {
   int D.1731;


Successfully bootstrapped and regrtested on x86_64 Linux (Fedora 20).

A couple of test cases needed tweaking, since they were counting the
number of occurrences of "int" in the gimple dump, which thus changed
for functions returning int (like the one above).

OK for next stage 1?

[motivation: am generating code in my JIT from other program's
representations, and have been debugging type mismatches in function
calls; the precise return types would otherwise have been non-obvious]
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