Fix FP special tests to not broadcast

Broadcasting is not supported by FP special tests as this
effects the values tested. This changes the code so that the
shape list updates are seen by the calling generation functions,
and adds sanity checks to the data generation to enforce this.

Signed-off-by: Jeremy Johnson <jeremy.johnson@arm.com>
Change-Id: Ia136ebadc1e03c4c61da44fdff3e7dbc3b03e3c8