Revert "[SIL] Add flag to SILFunctionType::Profile for async."

This reverts commit b8976a3.

Author: nate-chandler

include/swift/AST/Types.h

@@ -4575,14 +4575,14 @@ class SILFunctionType final
 
   void Profile(llvm::FoldingSetNodeID &ID) {
     Profile(ID, getInvocationGenericSignature(),
-            getExtInfo(), isAsync(), getCoroutineKind(), getCalleeConvention(),
+            getExtInfo(), getCoroutineKind(), getCalleeConvention(),
             getParameters(), getYields(), getResults(),
             getOptionalErrorResult(), getWitnessMethodConformanceOrInvalid(),
             getPatternSubstitutions(), getInvocationSubstitutions());
   }
   static void
   Profile(llvm::FoldingSetNodeID &ID, GenericSignature genericSig, ExtInfo info,
-          bool isAsync, SILCoroutineKind coroutineKind, ParameterConvention calleeConvention,
+          SILCoroutineKind coroutineKind, ParameterConvention calleeConvention,
           ArrayRef<SILParameterInfo> params, ArrayRef<SILYieldInfo> yields,
           ArrayRef<SILResultInfo> results, Optional<SILResultInfo> errorResult,
           ProtocolConformanceRef conformance,

lib/AST/ASTContext.cpp

@@ -3260,7 +3260,6 @@ void SILFunctionType::Profile(
     llvm::FoldingSetNodeID &id,
     GenericSignature genericParams,
     ExtInfo info,
-    bool isAsync,
     SILCoroutineKind coroutineKind,
     ParameterConvention calleeConvention,
     ArrayRef<SILParameterInfo> params,
@@ -3274,7 +3273,6 @@ void SILFunctionType::Profile(
   auto infoKey = info.getFuncAttrKey();
   id.AddInteger(infoKey.first);
   id.AddPointer(infoKey.second);
-  id.AddBoolean(isAsync);
   id.AddInteger(unsigned(coroutineKind));
   id.AddInteger(unsigned(calleeConvention));
   id.AddInteger(params.size());
@@ -3486,8 +3484,8 @@ CanSILFunctionType SILFunctionType::get(
   invocationSubs = invocationSubs.getCanonical();
 
   llvm::FoldingSetNodeID id;
-  SILFunctionType::Profile(id, genericSig, ext, isAsync, coroutineKind, callee,
-                           params, yields, normalResults, errorResult,
+  SILFunctionType::Profile(id, genericSig, ext, coroutineKind, callee, params,
+                           yields, normalResults, errorResult,
                            witnessMethodConformance,
                            patternSubs, invocationSubs);