Added an explicatory comment, thanks to Dmitri Gribenko for the suggestion.

scallanan · scallanan · commit 567602bb05cf · 2016-08-12T10:02:38.000-07:00
diff --git a/stdlib/public/core/DebuggerSupport.swift b/stdlib/public/core/DebuggerSupport.swift
@@ -283,6 +283,9 @@ public enum _DebuggerSupport {
     }
   }
 
+  // LLDB uses this function in expressions, and if it is inlined the resulting
+  // LLVM IR is enormous.  As a result, to improve LLDB performance we have made
+  // this stdlib_binary_only, which prevents inlining.
   @_semantics("stdlib_binary_only")
   public static func stringForPrintObject(_ value: Any) -> String {
     var maxItemCounter = Int.max

Original file line number	Diff line number	Diff line change
`@@ -283,6 +283,9 @@ public enum _DebuggerSupport {`
`283`	`283`	`}`
`284`	`284`	`}`
`285`	`285`
	`286`	`+ // LLDB uses this function in expressions, and if it is inlined the resulting`
	`287`	`+ // LLVM IR is enormous. As a result, to improve LLDB performance we have made`
	`288`	`+ // this stdlib_binary_only, which prevents inlining.`
`286`	`289`	`@_semantics("stdlib_binary_only")`
`287`	`290`	`public static func stringForPrintObject(_ value: Any) -> String {`
`288`	`291`	`var maxItemCounter = Int.max`