[test] Remove redirection stderr->out that corrupted output.

The RUN line was redirecting stderr to stdout, but nothing in the test
was checking for the stderr output.

However, the last line of stderr was an empty newline, which was printed
(in my machine) in the middle of the dump from the AST, breaking the
test.

If we ever need to check the stderr, it should be redirected to a file,
and the file should be passed to FileCheck independently, to avoid
concurrent uses of the output buffer.

Author: drodriguez

test/Frontend/dump-parse.swift

@@ -1,4 +1,4 @@
-// RUN: not %target-swift-frontend -dump-parse %s 2>&1 | %FileCheck %s
+// RUN: not %target-swift-frontend -dump-parse %s | %FileCheck %s
 // RUN: not %target-swift-frontend -dump-ast %s | %FileCheck %s -check-prefix=CHECK-AST
 
 // CHECK-LABEL: (func_decl{{.*}}"foo(_:)"