[Ada] Do not give "bad indentation" error inside a declare_expression

[Pierre-Marie de Rodat]

In -gnatg mode, gnat complains "bad indentation" if a statement or
declaration does not start in a column divisible by 3.  This patch fixes
a bug in which it complained similarly about a declare_expression, which
is not a statement or declaration.

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

2020-06-17  Bob Duff  <duff@adacore.com>

gcc/ada/

	* par.adb (P_Basic_Declarative_Items): Update comment about
	Declare_Expression.
	* par-ch3.adb (P_Declarative_Items): Pass in Declare_Expression
	flag, and if True, skip the call to Style.Check_Indentation.
	* par-ch4.adb (P_Declare_Expression): Fix incorrect comment.
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