[committed] RISC-V: Fix minor testsuite problem with zicond

[committed] RISC-V: Fix minor testsuite problem with zicond

I thought I had already fixed this, but clearly if I did, I didn't include it
in any upstream commits.

With -Og the optimizers are hindered in various ways and this prevents using
zicond.  So skip this test with -Og (it was already being skipped at -O0).

gcc/testsuite
	* gcc.target/riscv/zicond-primitiveSemantics.c: Disable for -Og.