[llvm] [TTI][Inline] Define inlining behavior in SubtargetFeature (PR #205348)

[Nikita Popov via llvm-commits]

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@@ -522,11 +522,25 @@ class DwarfRegAlias<Register reg> {
       Register DwarfAlias = reg;
 }
 
+// Determine whether inlining is allowed if caller and callee differ in whether
+// a feature is enabled.
+class InlineBehavior;
+
+// Arbitrary differences are allowed.
+def InlineIgnore : InlineBehavior;
+// Allow caller to enable feature even if callee does not.
+// (InlineDefault caller features are a superset of callee features.)
+def InlineDefault : InlineBehavior;
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nikic wrote:

Yeah, that makes sense. I've adopted your wording.

https://github.com/llvm/llvm-project/pull/205348