tree: Fix typos in various files

Signed-off-by: Dhruv Chawla <dhruvc@nvidia.com>

gcc/ChangeLog:

	* tree-assume.cc (assume_query::calculate_phi): Fix typos.
	* tree-cfg.cc (assign_discriminators): Likewise.
	(stmt_starts_bb_p): Likewise.
	(move_stmt_op): Likewise.
	(ifconvertable_edge): Likewise.
	* tree-cfgcleanup.cc (maybe_remove_forwarder_block): Likewise.
	(cleanup_tree_cfg_noloop): Likewise.
	* tree-chrec.cc (scev_is_linear_expression): Likewise.
	* tree-complex.cc (expand_complex_div_wide): Likewise.
	* tree-core.h (enum built_in_class): Likewise.
	* tree-data-ref.cc (dump_alias_pair): Likewise.
	(create_ifn_alias_checks): Likewise.
	* tree-data-ref.h (struct data_dependence_relation): Likewise.
	* tree-eh.cc (lower_try_finally_fallthru_label): Likewise.
	(lower_eh_dispatch): Likewise.
	* tree-if-conv.cc (idx_within_array_bound): Likewise.
	(base_object_writable): Likewise.
	(ifcvt_memrefs_wont_trap): Likewise.
	(get_loop_body_in_if_conv_order): Likewise.
	(predicate_scalar_phi): Likewise.
	* tree-inline.cc (remap_type_1): Likewise.
	(declare_return_variable): Likewise.
	(inline_forbidden_p): Likewise.
	(estimate_num_insns): Likewise.
	(copy_decl_for_dup_finish): Likewise.
	* tree-into-ssa.cc (get_ssa_name_ann): Likewise.
	(clear_ssa_name_info): Likewise.
	(insert_updated_phi_nodes_compare_uids): Likewise.
	(update_ssa): Likewise.
	* tree-loop-distribution.cc (enum partition_kind): Likewise.
	(struct partition): Likewise.
	(class loop_distribution): Likewise.
	(loop_distribution::classify_partition): Likewise.
	(loop_distribution::pg_add_dependence_edges): Likewise.
	(add_partition_graph_edge): Likewise.
	(free_partition_graph_vdata): Likewise.
	(pg_unmark_merged_alias_ddrs): Likewise.
	(version_loop_by_alias_check): Likewise.
	* tree-object-size.cc (gimplify_size_expressions): Likewise.
	(object_sizes_execute): Likewise.
	* tree-parloops.cc (parloops_is_simple_reduction): Likewise.
	(transform_to_exit_first_loop_alt): Likewise.
	* tree-predcom.cc (pcom_worker::suitable_component_p): Likewise.
	(pcom_worker::determine_roots_comp): Likewise.
	(prepare_initializers_chain_store_elim): Likewise.
	(pcom_worker::tree_predictive_commoning_loop): Likewise.
	* tree-profile.cc (condition_uid): Likewise.
	(cov_length): Likewise.
	(tree_profiling): Likewise.
	* tree-scalar-evolution.cc (scev_dfs::add_to_evolution_1): Likewise.
	(scev_reset): Likewise.
	(expression_expensive_p): Likewise.
	* tree-sra.cc (struct access): Likewise.
	(build_access_from_call_arg): Likewise.
	(path_comparable_for_same_access): Likewise.
	(child_would_conflict_in_acc): Likewise.
	(sra_modify_call_arg): Likewise.
	* tree-switch-conversion.cc (can_log2): Likewise.
	(switch_conversion::exp_index_transform): Likewise.
	* tree-switch-conversion.h (enum cluster_type): Likewise.
	* tree-vrp.cc (remove_unreachable::handle_early): Likewise.
	* tree.cc (build5): Likewise.
	(get_file_function_name): Likewise.
	(build_opaque_vector_type): Likewise.
	(array_ref_flexible_size_p): Likewise.
	(verify_type_variant): Likewise.
	(gimple_canonical_types_compatible_p): Likewise.
	* tree.h (decl_debug_args_insert): Likewise.
	(strip_pointer_types): Likewise.