varasm: Handle RAW_DATA_CST in compare_constant [PR117199]

varasm: Handle RAW_DATA_CST in compare_constant [PR117199]

On the following testcase without LTO we unnecessarily don't merge
two identical .LC* constants (constant hashing computes the same hash,
but as compare_constant returned false for the RAW_DATA_CST in it,
it never compares equal), and with LTO fails to link because LTO assumes such
constants have to be merged and so doesn't emit the other constant.

2024-10-22  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/117199
	* varasm.cc (compare_constant): Handle RAW_DATA_CST.  Formatting fix
	in the STRING_CST case.

	* gcc.dg/lto/pr117199_0.c: New test.