* params.def (PARAM_SRA_MAX_STRUCTURE_SIZE): New.
	(PARAM_SRA_FIELD_STRUCTURE_RATIO): Likewise.
	* params.h (SRA_MAX_STRUCTURE_SIZE): New.
	(SRA_FIELD_STRUCTURE_RATIO): Likewise.
	* tree-sra.c: Include "params.h".
	(decide_block_copy): Use new parameters.
	* doc/invoke.texi (Optimize Options): Document new SRA pass
	parameters sra-max-structure-size and sra-field-structure-ratio.

[testsuite]
	* gcc.dg/tree-ssa/sra-1.c: Pass --param sra-max-structure-size.

From-SVN: r89711