Fix timings tests on Windows x86
Fix timings tests on Windows x86

Some values > 2^32 were being truncated. This fix makes
all the proper fields be hrtime_t.

Change-Id: I0c78a55c74041dfb0ef473c2051e3c20d29ae531
Reviewed-on: http://review.couchbase.org/48167
Reviewed-by: Subhashni Balakrishnan <7129c8e37b832c7bd362ff375532d24b98ef5162@gmail.com>
Tested-by: Mark Nunberg <dab05a0fe859c5cb93882b2a75a0d613501b07be@couchbase.com>

avsej/libcouchbase,senthilkumaranb/libcouchbase,kojiromike/libcouchbase,maxim-ky/libcouchbase,kojiromike/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,PureSwift/libcouchbase,signmotion/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,mody/libcouchbase,PureSwift/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,signmotion/libcouchbase,PureSwift/libcouchbase,maxim-ky/libcouchbase,PureSwift/libcouchbase,senthilkumaranb/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,avsej/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase