IR: drop RA validation

There's no reasonable way to keep this around without adding significant
complexity to RA. This series prefers to drop complexity from RA, lessening the
need for validation in the first place.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

FEXCore/Source/Interface/IR/PassManager.cpp

@@ -79,7 +79,6 @@ void PassManager::AddDefaultPasses(FEXCore::Context::ContextImpl* ctx) {
 void PassManager::AddDefaultValidationPasses() {
 #if defined(ASSERTIONS_ENABLED) && ASSERTIONS_ENABLED
   InsertValidationPass(Validation::CreateIRValidation(), "IRValidation");
-  InsertValidationPass(Validation::CreateRAValidation());
 #endif
 }