Revert "[Sema|Tests] Update users of library-level=api to expect new diagnostics"

This reverts commit d4a5cb2.

Author: xymus

test/ClangImporter/availability_spi_as_unavailable.swift

@@ -13,7 +13,7 @@ public let c: SPIInterface1 // expected-error{{cannot use class 'SPIInterface1'
 public let d: SPIInterface2 // expected-error{{cannot use class 'SPIInterface2' here; it is an SPI imported from 'SPIContainer'}}
 
 @inlinable
-public func inlinableUsingSPI() { // expected-warning{{public declarations should have an availability attribute with an introduction version}}
+public func inlinableUsingSPI() {
   SharedInterface.foo() // expected-error{{class method 'foo()' cannot be used in an '@inlinable' function because it is an SPI imported from 'SPIContainer'}}
 }
 

test/ClangImporter/availability_spi_as_unavailable_bridging_header.swift

@@ -9,6 +9,6 @@ public let c: SPIInterface1 // expected-error{{cannot use class 'SPIInterface1'
 public let d: SPIInterface2 // expected-error{{cannot use class 'SPIInterface2' here; it is an SPI imported from '__ObjC'}}
 
 @inlinable
-public func inlinableUsingSPI() { // expected-warning{{public declarations should have an availability attribute with an introduction version}}
+public func inlinableUsingSPI() {
   SharedInterface.foo() // expected-error{{class method 'foo()' cannot be used in an '@inlinable' function because it is an SPI imported from '__ObjC'}}
 }

test/SPI/spi-only-and-library-level.swift

@@ -25,7 +25,6 @@ public struct LibStruct {}
 @_spiOnly import Lib
 
 public func publicClient() -> LibStruct { fatalError() } // expected-error {{cannot use struct 'LibStruct' here; 'Lib' was imported for SPI only}}
-// expected-warning @-1 {{public declarations should have an availability attribute with an introduction version}}
 @_spi(X) public func spiClient() -> LibStruct { fatalError() }
 
 //--- SPILib.swift

test/Sema/spi-available-inline.swift

@@ -10,7 +10,7 @@ public class MacOSSPIClass { public init() {} }
 @available(macOS 10.4, *)
 public class iOSSPIClass { public init() {} }
 
-@inlinable public func foo() { // expected-warning{{public declarations should have an availability attribute with an introduction version}}
+@inlinable public func foo() {
 	_ = MacOSSPIClass() // expected-error {{class 'MacOSSPIClass' cannot be used in an '@inlinable' function because it is SPI}}
 	_ = iOSSPIClass()
 }

test/attr/attr_inlinable_available.swift

@@ -14,7 +14,7 @@
 
 
 // Check that `-library-level api` implies `-target-min-inlining-version min`
-// RUN: %target-typecheck-verify-swift -swift-version 5 -enable-library-evolution -module-name Test -target %target-next-stable-abi-triple -library-level api -require-explicit-availability=ignore
+// RUN: %target-typecheck-verify-swift -swift-version 5 -enable-library-evolution -module-name Test -target %target-next-stable-abi-triple -library-level api
 
 
 // Check that these rules are only applied when requested and that at least some
@@ -24,7 +24,7 @@
 
 // Check that -target-min-inlining-version overrides -library-level, allowing
 // library owners to disable this behavior for API libraries if needed.
-// RUN: not %target-typecheck-verify-swift -swift-version 5 -enable-library-evolution -module-name Test -target %target-next-stable-abi-triple -target-min-inlining-version target -library-level api -require-explicit-availability=ignore 2>&1 | %FileCheck --check-prefix NON_MIN %s
+// RUN: not %target-typecheck-verify-swift -swift-version 5 -enable-library-evolution -module-name Test -target %target-next-stable-abi-triple -target-min-inlining-version target -library-level api 2>&1 | %FileCheck --check-prefix NON_MIN %s
 
 
 // Check that we respect -target-min-inlining-version by cranking it up high