[PATCH] libstdc++: Fix test assumptions on long and long double

[Matthias Kretz]

OK for master and all backports (after 11.4 is done)

tested on powerpc64le-linux-gnu (with 64-bit long double)

----------- 8< ------------

Expect that long might not fit into the long double mantissa bits.

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

libstdc++-v3/ChangeLog:

	* testsuite/experimental/simd/tests/operator_cvt.cc: Make long
	double <-> (u)long conversion tests conditional on sizeof(long
	double) and sizeof(long).
---
 .../experimental/simd/tests/operator_cvt.cc   | 30 +++++++++++++++----
 1 file changed, 24 insertions(+), 6 deletions(-)


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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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