[Ada] Missing actual for generated initialization procedure

[Pierre-Marie de Rodat]

This patch fixes an issue whereby the use of an allocator with a
composite type containing null-excluding components may lead to a
compile time error due to incorrect code generation.

Tested on x86_64-pc-linux-gnu, committed on trunk

2019-07-04  Justin Squirek  <squirek@adacore.com>

gcc/ada/

	* exp_ch3.adb (Build_Initialization_Call): Fixup
	*_skip_null_excluding_check argument to handle new default.
	(Init_Formals): Make *_skip_null_excluding_check formal default
	to False
	* exp_ch4.adb (Expand_N_Allocator): Add comment to note heavy
	code duplication

gcc/testsuite/

	* gnat.dg/allocator.adb: New testcase.
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