Use @_alwaysEmitIntoClient for new entrypoints

Author: DougGregor

stdlib/public/core/ArrayBuffer.swift

@@ -586,6 +586,7 @@ extension _ArrayBuffer {
   /// underlying contiguous storage.  If no such storage exists, it is
   /// created on-demand.
   @inlinable
+  @_alwaysEmitIntoClient
   internal func withUnsafeBufferPointer<R, E>(
     _ body: (UnsafeBufferPointer<Element>) throws(E) -> R
   ) throws(E) -> R {

stdlib/public/core/ContiguousArrayBuffer.swift

@@ -459,6 +459,7 @@ internal struct _ContiguousArrayBuffer<Element>: _ArrayBufferProtocol {
   /// Call `body(p)`, where `p` is an `UnsafeBufferPointer` over the
   /// underlying contiguous storage.
   @inlinable
+  @_alwaysEmitIntoClient
   internal func withUnsafeBufferPointer<R, E>(
     _ body: (UnsafeBufferPointer<Element>) throws(E) -> R
   ) throws(E) -> R {

stdlib/public/core/SliceBuffer.swift

@@ -445,6 +445,7 @@ internal struct _SliceBuffer<Element>
   /// Call `body(p)`, where `p` is an `UnsafeBufferPointer` over the
   /// underlying contiguous storage.
   @inlinable
+  @_alwaysEmitIntoClient
   internal func withUnsafeBufferPointer<R, E>(
     _ body: (UnsafeBufferPointer<Element>) throws(E) -> R
   ) throws(E) -> R {

test/abi/macOS/arm64/stdlib.swift

@@ -583,12 +583,8 @@ Added: _$sSS20_immortalCocoaString5count8encodingSSyXl_Sixmtcs16_UnicodeEncoding
 Added: _$ss33_stdlib_isVariantOSVersionAtLeastyBi1_Bw_BwBwtF
 
 // Typed throws for withUnsafeBufferPointer operations.
-Added: _$ss12_ArrayBufferV010withUnsafeB7Pointeryqd__qd__SRyxGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF
-Added: _$ss12_SliceBufferV010withUnsafeB7Pointeryqd__qd__SRyxGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF
 Added: _$ss20_ArrayBufferProtocolP010withUnsafeB7Pointeryqd__qd__SRy7ElementQzGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lFTj
 Added: _$ss20_ArrayBufferProtocolP010withUnsafeB7Pointeryqd__qd__SRy7ElementQzGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lFTq
-Added: _$ss22_ContiguousArrayBufferV010withUnsafeC7Pointeryqd__qd__SRyxGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF
-
 
 // Typed throws for withUnsafeMutableBufferPointer operations.
 Added: _$ss20_ArrayBufferProtocolP017withUnsafeMutableB7Pointeryqd__qd__Sry7ElementQzGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lFTj

test/abi/macOS/x86_64/stdlib.swift

@@ -583,10 +583,7 @@ Added: _$sSS20_immortalCocoaString5count8encodingSSyXl_Sixmtcs16_UnicodeEncoding
 Added: _$ss33_stdlib_isVariantOSVersionAtLeastyBi1_Bw_BwBwtF
 
 // Typed throws for withUnsafeBufferPointer operations.
-Added: _$ss12_ArrayBufferV010withUnsafeB7Pointeryqd__qd__SRyxGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF
-Added: _$ss12_SliceBufferV010withUnsafeB7Pointeryqd__qd__SRyxGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF
 Added: _$ss20_ArrayBufferProtocolP010withUnsafeB7Pointeryqd__qd__SRy7ElementQzGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lFTj
-Added: _$ss22_ContiguousArrayBufferV010withUnsafeC7Pointeryqd__qd__SRyxGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF
 Added: _$ss20_ArrayBufferProtocolP010withUnsafeB7Pointeryqd__qd__SRy7ElementQzGqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lFTq
 
 // Typed throws for withUnsafeMutableBufferPointer operations.