[System.ServiceModel.Web] Fix regression when converting strings using some (like German) cultures [#18131] and add unit test
Data corruption using SslStream (Xamarin bug 15293)

When reading and writing data at the same time over an
System.Net.Security.SslStream, an exception will be thrown often.
Usually the exception is: Mono.Security.Protocol.Tls.TlsException “Bad
record MAC”

The issue is that the single TlsCipherSuite instance used for both
reading and writing does not synchronize access to the “header” member.
If the contents get corrupted the MAC calculation returned by
ComputServerRecordMAC or ComputeClientRecordMAC is incorrect.

See https://bugzilla.xamarin.com/show_bug.cgi?id=15293. Reproduced in
OS X, iOS and Windows.
[jit] Fix an uninitialized memory problem in the soft-float code.
[jit] Allow inlining of calls to method with the AggressiveInlining attribute in aot mode.
[jit] Avoid forcing initlocals to TRUE when the 'unsafe' optimization flag is set. Fixes #18068.
[jit] Add LLVM support for the new OP_DUMMY_ opcodes.
[jit] Add support for the new DUMMY_ opcodes to the arm backend.
[sdb] Add some debug output to help track down #18100.
[mdoc] Fix the tests.
[interpreter] Size reduction