'DecimalImpUtil::makeDecimal64' tests.
'DecimalImpUtil::makeDecimal64' tests.

The 'makeDecimal64' function is a wide-contract variation of the
'makeDecimalRaw64' function.  This test case is directly adapted
from the original test case in 'DecimalUtil'.  Only minor changes
were needed to get it to build.  All of the original concerns
still hold.

bloomberg/bde,dharesign/bde,gbleaney/Allocator-Benchmarks,frutiger/bde,dbremner/bde,saxena84/bde,mversche/bde,gbleaney/Allocator-Benchmarks,apaprocki/bde,abeels/bde,mversche/bde,abeels/bde,bloomberg/bde,bloomberg/bde,minhlongdo/bde,che2/bde,che2/bde,RMGiroux/bde-allocator-benchmarks,gbleaney/Allocator-Benchmarks,gbleaney/Allocator-Benchmarks,RMGiroux/bde-allocator-benchmarks,bloomberg/bde-allocator-benchmarks,RMGiroux/bde-allocator-benchmarks,jmptrader/bde,osubboo/bde,idispatch/bde,dharesign/bde,minhlongdo/bde,apaprocki/bde,mversche/bde,frutiger/bde,frutiger/bde,dharesign/bde,apaprocki/bde,bowlofstew/bde,bloomberg/bde-allocator-benchmarks,saxena84/bde,bloomberg/bde-allocator-benchmarks,bowlofstew/bde,frutiger/bde,che2/bde,jmptrader/bde,jmptrader/bde,bloomberg/bde,saxena84/bde,RMGiroux/bde-allocator-benchmarks,mversche/bde,bloomberg/bde-allocator-benchmarks,osubboo/bde,bloomberg/bde-allocator-benchmarks,osubboo/bde,saxena84/bde,abeels/bde,RMGiroux/bde-allocator-benchmarks,dbremner/bde,apaprocki/bde,minhlongdo/bde,osubboo/bde,abeels/bde,bowlofstew/bde,apaprocki/bde,dbremner/bde,idispatch/bde,abeels/bde,minhlongdo/bde,bowlofstew/bde,dbremner/bde,bloomberg/bde,abeels/bde,idispatch/bde,jmptrader/bde,dharesign/bde,idispatch/bde,che2/bde