Improve coverage of utils/float.h

Michael Paquier <michael@paquier.xyz>

Commit: 80d0e5ba3fe03890831b425e85d10150e226239e
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-08-28T03:28:16Z
Releases: 13.0
Improve coverage of utils/float.h

check_float4_val() checks after underflow and overflow of values
converted from float8 to float4, but there has never been any regression
tests for that.  This brings the coverage of float.h to 100%.

Author: Movead Li
Discussion: https://postgr.es/m/20190822174636998766188@highgo.ca

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