Optimization of data initialization for large sparce datasets #3074

Job	Run time
Test installing XGBoost lib + building the C API demo	8m 39s
Configure variables for CI	8s
Test Google C++ unittest (CPU Non-OMP)	5m 50s
Build 32-bit (i386)	2m 51s
Build docs for JVM packages	7m 6s
Build docs for the R package	5m 27s
Trigger Read The Docs build	10s
	30m 11s

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