Some Vector API changes

Author: Azoy

stdlib/public/core/CMakeLists.txt

@@ -319,7 +319,6 @@ 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" "BitwiseCopyable")
-list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "RawLayout")
 list(APPEND swift_stdlib_compile_flags "-enable-experimental-feature" "ValueGenerics")
 
 if("${SWIFT_NATIVE_SWIFT_TOOLS_PATH}" STREQUAL "")