[committed] libstdc++: Resolve -Wsign-compare issue

[Matthias Kretz]

pushed to master, will backport later

tested on x86_64-pc-linux-gnu and powerpc64le-linux-gnu

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Signed-off-by: Matthias Kretz <m.kretz@gsi.de>

libstdc++-v3/ChangeLog:

	* include/experimental/bits/simd_ppc.h (_S_bit_shift_left):
	Negative __y is UB, so prefer signed compare.
---
 libstdc++-v3/include/experimental/bits/simd_ppc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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 Dr. Matthias Kretz                           https://mattkretz.github.io
 GSI Helmholtz Centre for Heavy Ion Research               https://gsi.de
 stdₓ::simd
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