[committed] [RISC-V] Fix bug in condition canonicalization for zicond

[committed] [RISC-V] Fix bug in condition canonicalization for zicond

Vineet's glibc build triggered an ICE building glibc with the latest zicond
bits.  It's a minor issue in the canonicalization of the condition.

When we need to canonicalize the condition we use an SCC insn to handle the
primary comparison with the output going into a temporary with the final value
of 0/1 which we can then use in a zicond instruction.

The mode of the newly generated temporary was taken from mode of the final
destination.  That's simply wrong.  The mode of the condition needs to be
word_mode.

This patch fixes that minor problem and adds a suitable testcase.

gcc/
	* config/riscv/riscv.cc (riscv_expand_conditional_move): Use word_mode
	for the temporary when canonicalizing the condition.

gcc/testsuite
	* gcc.target/riscv/zicond-ice-1.c: New test.