[BitwiseCopyable] Promote ConformanceSuppression.

The ability to suppress conformance to BitwiseCopyable was part of the
accepted SE-428.

Author: nate-chandler

include/swift/Basic/Features.def

@@ -178,6 +178,7 @@ SUPPRESSIBLE_LANGUAGE_FEATURE(AssociatedTypeImplements, 0, "@_implements on asso
 LANGUAGE_FEATURE(MoveOnlyPartialConsumption, 429, "Partial consumption of noncopyable values")
 /// Enable bitwise-copyable feature.
 LANGUAGE_FEATURE(BitwiseCopyable, 426, "BitwiseCopyable protocol")
+SUPPRESSIBLE_LANGUAGE_FEATURE(ConformanceSuppression, 426, "Suppressible inferred conformances")
 
 // Swift 6
 UPCOMING_FEATURE(ConciseMagicFile, 274, 6)
@@ -341,9 +342,6 @@ EXPERIMENTAL_FEATURE(StaticExclusiveOnly, true)
 /// Enable the @extractConstantsFromMembers attribute.
 EXPERIMENTAL_FEATURE(ExtractConstantsFromMembers, false)
 
-/// Enable the suppression of inferred, non-invertible, protocols via ~.
-SUPPRESSIBLE_EXPERIMENTAL_FEATURE(ConformanceSuppression, true)
-
 /// Enables the FixedArray data type.
 EXPERIMENTAL_FEATURE(FixedArrays, true)
 

stdlib/public/core/CMakeLists.txt

@@ -316,7 +316,6 @@ list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "Macros")
 list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "FreestandingMacros")
 list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "Extern")
 list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "BorrowingSwitch")
-list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "ConformanceSuppression")
 
 if("${SWIFT_NATIVE_SWIFT_TOOLS_PATH}" STREQUAL "")
   set(swift_bin_dir "${CMAKE_BINARY_DIR}/bin")

test/SILGen/bitwise_copyable.swift

@@ -2,7 +2,6 @@
 // RUN:     %s                                                  \
 // RUN:     -emit-silgen                                        \
 // RUN:     -disable-availability-checking                      \
-// RUN:     -enable-experimental-feature ConformanceSuppression \
 // RUN:     -enable-builtin-module
 
 // REQUIRES: asserts

test/Sema/bitwise_copyable_2.swift

@@ -1,6 +1,5 @@
 // RUN: %target-typecheck-verify-swift                          \
 // RUN:     -enable-experimental-feature NonescapableTypes      \
-// RUN:     -enable-experimental-feature ConformanceSuppression \
 // RUN:     -enable-builtin-module                              \
 // RUN:     -debug-diagnostic-names