Remove trailing CR in test-generated.ll.

Add the option `strip-trailing-cr` to avoid CR/LF-related test failures.
The dialect files are created with LF, thus we don't want to see diff
mismatches in git environments which check out with CRLF.

Author: tsymalla-AMD

test/example/test-generated.test

@@ -1,2 +1,2 @@
-; RUN: diff -U 5 %S/generated/ExampleDialect.h.inc test_build_dir/../example/ExampleDialect.h.inc
-; RUN: diff -U 5 %S/generated/ExampleDialect.cpp.inc test_build_dir/../example/ExampleDialect.cpp.inc
+; RUN: diff --strip-trailing-cr -U 5 %S/generated/ExampleDialect.h.inc test_build_dir/../example/ExampleDialect.h.inc
+; RUN: diff --strip-trailing-cr -U 5 %S/generated/ExampleDialect.cpp.inc test_build_dir/../example/ExampleDialect.cpp.inc