[6.1] Don’t remove #if
attributes with AttributeRemover
#2947
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#if
. Change the behavior to never remove them since we can’t evaluate#if
.assertMacroExpansion
SyntaxProtocol.expand(macros:)
dropsIfConfigDeclSyntax
nodes from result #2923 / rdar://141840779#if
attributes withAttributeRemover
#2945