[expand PATCH] PR/40597 part 2: fix powerpc bootstrap

[Eric Botcazou]

> Fixed by doing a convert_move back to the target.  Bootstrap/regtest in
> progress, but on a target that didn't show the bug in the first place.
> It fixes both testcases posted in the audit trail of the PR (thanks Peter).

The Ada compiler (uintp.adb:UI_From_Int) is miscompiled on i686 at -O0 after 
your expmed.c changes, leading to 4 ACATS failures:

		=== acats tests ===
FAIL:	c34004c
FAIL:	c490003
FAIL:	c4a010b
FAIL:	cxa5a04

		=== acats Summary ===
# of expected passes		2311
# of unexpected failures	4


Reduced C testcase attached.  The conversion in emit_store_flag_1

	  convert_move (target, tem,
			0 == (STORE_FLAG_VALUE
			      & ((HOST_WIDE_INT) 1
				 << (GET_MODE_BITSIZE (word_mode) -1))));

is performed unsigned, while it would need to be signed.

-- 
Eric Botcazou
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