Merge pull request swiftlang#10096 from swiftix/inliner-improvements2

Reduce code size of the stdlib

Author: swiftix

stdlib/public/core/IntegerParsing.swift

@@ -87,6 +87,7 @@ extension FixedWidthInteger {
   // _parseASCII function thunk that prevents inlining used as an implementation
   // detail for FixedWidthInteger.init(_: radix:) on the slow path to save code
   // size.
+  @_semantics("optimize.sil.specialize.generic.partial.never")
   @inline(never)
   internal static func _parseASCIISlowPath<
     CodeUnits : IteratorProtocol, Result: FixedWidthInteger
@@ -129,6 +130,7 @@ extension FixedWidthInteger {
   ///     `radix`.
   ///   - radix: The radix, or base, to use for converting `text` to an integer
   ///     value. `radix` must be in the range `2...36`. The default is 10.
+  @_semantics("optimize.sil.specialize.generic.partial.never")
   public init?/*<S : StringProtocol>*/(_ text: String, radix: Int = 10) {
     _precondition(2...36 ~= radix, "Radix not in range 2...36")
     let r = Self(radix)

stdlib/public/core/String.swift

@@ -169,6 +169,7 @@ where Source.Iterator.Element == SourceEncoding.CodeUnit {
     encodedAs: sourceEncoding) { p, _ in try body(p) }
 }
 
+@_semantics("optimize.sil.specialize.generic.partial.never")
 internal func _withCStringAndLength<
   Source : Collection,
   SourceEncoding : Unicode.Encoding,