* blockframe.c (block_innermost_frame): Uncomment.

	* blockframe.c (block_innermost_frame): Uncomment.
	Return NULL if passed NULL.
	* frame.h: Declare it.
	* expression.h (union exp_element): Add field block.
	* parse.c (write_exp_elt_block): New function.
	* expression.h (OP_VAR_VALUE): Now takes additional struct block *.
	* *-exp.y: Write block for OP_VAR_VALUE.
	* eval.c, expprint.c, parse.c: Deal with block for OP_VAR_VALUE.
	* valops.c, value.h (value_of_variable), callers:
	Add second argument, for block.