[committed][middle-end][SLP] Initialize variable to fix bootstrap after r277784.

[Tamar Christina]

Hi All,

This initializes the rstmt variable with NULL and adds an assert to
check that a value has been given by one of the if cases before use.

This fixes the bootstrap failure due to -Werror.

Bootstrapped on aarch64-none-linux-gnu and no issues.

Committed under the gcc obvious rule.

gcc/ChangeLog:

2019-11-04  Tamar Christina  <tamar.christina@arm.com>

	* tree-vect-slp.c (vectorize_slp_instance_root_stmt): Initialize rstmt.

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