Add some pre-specializations for internal stdlib functions in SwiftOnoneSupport

It's very unlikely that those functions are really referenced by Onone executables, but we want to be ABI compatible.
Also, there is no guarantee that this version of SwiftOnoneSupport will always trigger all symbol to be pre-specialized.
If the optimizer changes, we might need to add other explicit pre-specializations of internal stdlib symbols.

rdar://problem/48924409

Author: eeckstein

stdlib/public/SwiftOnoneSupport/SwiftOnoneSupport.swift

@@ -13,6 +13,71 @@
 //===----------------------------------------------------------------------===//
 import Swift
 
+// Explicitly force pre-specializations of some symbols of the library.
+// This makes the set of pre-specialized symbols more stable and not so
+// depending on the optimizer.
+@_semantics("prespecialize.$sS2ayxGycfC")
+@_semantics("prespecialize.$sSa034_makeUniqueAndReserveCapacityIfNotB0yyF")
+@_semantics("prespecialize.$sSa10startIndexSivg")
+@_semantics("prespecialize.$sSa11_getElement_20wasNativeTypeChecked22matchingSubscriptCheckxSi_Sbs16_DependenceTokenVtF")
+@_semantics("prespecialize.$sSa12_getCapacitySiyF")
+@_semantics("prespecialize.$sSa12arrayLiteralSayxGxd_tcfC")
+@_semantics("prespecialize.$sSa15_checkSubscript_20wasNativeTypeCheckeds16_DependenceTokenVSi_SbtF")
+@_semantics("prespecialize.$sSa15reserveCapacityyySiF")
+@_semantics("prespecialize.$sSa16_copyToNewBuffer8oldCountySi_tF")
+@_semantics("prespecialize.$sSa19_uninitializedCountSayxGSi_tcfC")
+@_semantics("prespecialize.$sSa21_makeMutableAndUniqueyyF")
+@_semantics("prespecialize.$sSa22_copyToContiguousArrays0cD0VyxGyF")
+@_semantics("prespecialize.$sSa28_unsafeUninitializedCapacity16initializingWithSayxGSi_ySryxGz_SiztKXEtKcfC")
+@_semantics("prespecialize.$sSa29_hoistableIsNativeTypeCheckedSbyF")
+@_semantics("prespecialize.$sSa36_reserveCapacityAssumingUniqueBuffer8oldCountySi_tF")
+@_semantics("prespecialize.$sSa37_appendElementAssumeUniqueAndCapacity_03newB0ySi_xntF")
+@_semantics("prespecialize.$sSa5countSivg")
+@_semantics("prespecialize.$sSa6appendyyxnF")
+@_semantics("prespecialize.$sSa8capacitySivg")
+@_semantics("prespecialize.$sSa8endIndexSivg")
+@_semantics("prespecialize.$sSa9_getCountSiyF")
+@_semantics("prespecialize.$sSa9formIndex5afterySiz_tF")
+@_semantics("prespecialize.$sSa9formIndex6beforeySiz_tF")
+@_semantics("prespecialize.$sSa9removeAll15keepingCapacityySb_tF")
+@_semantics("prespecialize.$sSa9removeAll15keepingCapacityySb_tFfA_")
+@_semantics("prespecialize.$sSa9removeAll15keepingCapacityySb_tF")
+@_semantics("prespecialize.$sSa9repeating5countSayxGx_SitcfC")
+@_semantics("prespecialize.$sSayxSiciM")
+@_semantics("prespecialize.$sSayxSicig")
+@_semantics("prespecialize.$sSayxSicir")
+@_semantics("prespecialize.$ss12_ArrayBufferV013requestNativeB0s011_ContiguousaB0VyxGSgyF")
+@_semantics("prespecialize.$ss12_ArrayBufferV027requestUniqueMutableBackingB015minimumCapacitys011_ContiguousaB0VyxGSgSi_tF")
+@_semantics("prespecialize.$ss12_ArrayBufferV10_nonNatives06_CocoaA7WrapperVvg")
+@_semantics("prespecialize.$ss12_ArrayBufferV10_typeCheckyySnySiGF")
+@_semantics("prespecialize.$ss12_ArrayBufferV10startIndexSivg")
+@_semantics("prespecialize.$ss12_ArrayBufferV13_copyContents8subRange12initializingSpyxGSnySiG_AFtF")
+@_semantics("prespecialize.$ss12_ArrayBufferV19_getElementSlowPathyyXlSiF")
+@_semantics("prespecialize.$ss12_ArrayBufferV19firstElementAddressSpyxGvg")
+@_semantics("prespecialize.$ss12_ArrayBufferV20isUniquelyReferencedSbyF")
+@_semantics("prespecialize.$ss12_ArrayBufferV37_checkInoutAndNativeTypeCheckedBounds_03wasfgH0ySi_SbtF")
+@_semantics("prespecialize.$ss12_ArrayBufferV5countSivs")
+@_semantics("prespecialize.$ss12_ArrayBufferV7_buffer19shiftedToStartIndexAByxGs011_ContiguousaB0VyxG_SitcfC")
+@_semantics("prespecialize.$ss12_ArrayBufferV7_natives011_ContiguousaB0VyxGvg")
+@_semantics("prespecialize.$ss12_ArrayBufferV8capacitySivg")
+@_semantics("prespecialize.$ss12_ArrayBufferV8endIndexSivg")
+@_semantics("prespecialize.$ss12_ArrayBufferV9_isNativeSbvg")
+@_semantics("prespecialize.$ss12_ArrayBufferVyxSicig")
+@_semantics("prespecialize.$ss12_ArrayBufferVyxSicir")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV10startIndexSivg")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV13_copyContents8subRange12initializingSpyxGSnySiG_AFtF")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV18_initStorageHeader5count8capacityySi_SitF")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV19firstElementAddressSpyxGvg")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV5countSivg")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV7_buffer19shiftedToStartIndexAByxGAE_SitcfC")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferV8endIndexSivg")
+@_semantics("prespecialize.$ss22_ContiguousArrayBufferVAByxGycfC")
+@_semantics("prespecialize.$ss12_ArrayBufferVyxGSlsSl5index5after5IndexQzAG_tFTW")
+@_semantics("prespecialize.$ss12_ArrayBufferVyxGSlsSl20_failEarlyRangeCheck_6boundsy5IndexQz_SnyAGGtFTW")
+func prespecializationProxy<T>(_ x: T) {
+}
+
+
 internal enum _Prespecialize {
   // Create specializations for the arrays of most
   // popular builtin integer and floating point types.
@@ -67,6 +132,14 @@ internal enum _Prespecialize {
       // force specialization of append.
       a.append(a[0])
 
+      #if _runtime(_ObjC)
+      // Explicitly specialize some private functions.
+      // It's very unlikely that those functions are really referenced from
+      // a Onone executable. But let's make sure all the swift 5.0 symbols
+      // are also in upcoming versions of the OnoneSupport library.
+      prespecializationProxy(sampleValue)
+      #endif
+
       // force specialization of print<Element>
       print(sampleValue)
       print("Element:\(sampleValue)")
@@ -118,6 +191,10 @@ internal enum _Prespecialize {
       // force specialization of append.
       a.append(a[0])
 
+      #if _runtime(_ObjC)
+      prespecializationProxy(sampleValue)
+      #endif
+
       // force specialization of print<Element>
       print(sampleValue)
       print("Element:\(sampleValue)")