[6.1][cxx-interop] Renove escapability interop annotations

As this feature is still under design, we do not want users to depend on
the semantics we ship in 6.1, so remove the annotations from the
bridging header. This PR also removes the tests that rely on these
annotations.

Author: Gabor Horvath

lib/ClangImporter/SwiftBridging/swift/bridging

@@ -39,12 +39,6 @@
 
 #define _CXX_INTEROP_STRINGIFY(_x) #_x
 
-#define _CXX_INTEROP_CONCAT_(a,b,c,d,e,f,g,i,j,k,l,m,n,o,p,...)         \
-  #a "," #b "," #c "," #d "," #e "," #f "," #g "," #i "," #j "," #k "," \
-  #l "," #m "," #n "," #o "," #p
-#define _CXX_INTEROP_CONCAT(...) \
-  _CXX_INTEROP_CONCAT_(__VA_ARGS__,,,,,,,,,,,,,,,,,)
-
 /// Specifies that a C++ `class` or `struct` is reference-counted using
 /// the given `retain` and `release` functions. This annotation lets Swift import
 /// such a type as reference counted type in Swift, taking advantage of Swift's
@@ -165,24 +159,6 @@
 #define SWIFT_NONCOPYABLE \
   __attribute__((swift_attr("~Copyable")))
 
-/// Specifies that a specific c++ type such class or struct should be imported
-/// as a non-escapable Swift value type when the non-escapable language feature
-/// is enabled.
-#define SWIFT_NONESCAPABLE \
-  __attribute__((swift_attr("~Escapable")))
-
-/// Specifies that a specific c++ type such class or struct should be imported
-/// as a escapable Swift value. While this matches the default behavior,
-/// in safe mode interop mode it ensures that the type is not marked as
-/// unsafe.
-#define SWIFT_ESCAPABLE \
-  __attribute__((swift_attr("Escapable")))
-
-/// Specifies that a C++ `class` or `struct` should be imported as a escapable
-/// Swift value if all of the specified template arguments are escapable.
-#define SWIFT_ESCAPABLE_IF(...) \
-  __attribute__((swift_attr("escapable_if:" _CXX_INTEROP_CONCAT(__VA_ARGS__))))
-
 /// Specifies that the return value is passed as owned for C++ functions and
 /// methods returning types annotated as `SWIFT_SHARED_REFERENCE`
 #define SWIFT_RETURNS_RETAINED __attribute__((swift_attr("returns_retained")))
@@ -205,9 +181,6 @@
 #define SWIFT_MUTATING 
 #define SWIFT_UNCHECKED_SENDABLE
 #define SWIFT_NONCOPYABLE
-#define SWIFT_NONESCAPABLE
-#define SWIFT_ESCAPABLE
-#define SWIFT_ESCAPABLE_IF(...)
 #define SWIFT_RETURNS_RETAINED
 #define SWIFT_RETURNS_UNRETAINED