libgccjit: Make is_same_type_as() support floating point types

gcc/jit/ChangeLog:

	* jit-recording.h: Fix float comparison.
	* libgccjit.cc: Fix type check in gcc_jit_context_new_comparison.

gcc/testsuite/ChangeLog:

	* jit.dg/all-non-failing-tests.h: Mention new test.
	* jit.dg/test-comparison.c: New test.

Co-authored-by: Antoni Boucher <bouanto@zoho.com>