[Serialization] Use a more reliable macro to get the compiler tag

Use only the SWIFT_COMPILER_VERSION macro to check for swiftmodules
being written by the same compiler that reads it. In practice, it's the
macro used for release builds of the compiler.

rdar://96868333

lib/Serialization/ModuleFileSharedCore.cpp

@@ -359,7 +359,7 @@ static ValidationInfo validateControlBlock(
       StringRef moduleRevision = blobData;
       if (isCompilerTagged) {
         StringRef compilerRevision = forcedDebugRevision ?
-          forcedDebugRevision : version::getSwiftRevision();
+          forcedDebugRevision : version::getCurrentCompilerTag();
         if (moduleRevision != compilerRevision) {
           result.status = Status::RevisionIncompatible;