Fix all illegal usages of safeAs function

Call of `safeAs` without specifying explicit type argument is hardly
  readable and may leads to hardly detectable errors

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/FirHelpers.kt

@@ -127,7 +127,7 @@ fun FirTypeRef.toRegularClass(session: FirSession): FirRegularClass? {
 inline fun <reified T : Any> FirQualifiedAccessExpression.getDeclaration(): T? {
     return this.calleeReference.safeAs<FirResolvedNamedReference>()
         ?.resolvedSymbol
-        ?.fir.safeAs()
+        ?.fir as? T
 }
 
 /**

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirCommonConstructorDelegationIssuesChecker.kt

@@ -94,5 +94,5 @@ object FirCommonConstructorDelegationIssuesChecker : FirRegularClassChecker() {
     private fun FirConstructor.getDelegated(): FirConstructor? = delegatedConstructor
         ?.calleeReference.safeAs<FirResolvedNamedReference>()
         ?.resolvedSymbol
-        ?.fir.safeAs()
+        ?.fir as? FirConstructor?
 }

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirOverrideChecker.kt

@@ -108,7 +108,7 @@ object FirOverrideChecker : FirClassChecker() {
         overriddenSymbols: List<FirCallableSymbol<*>>,
     ): FirMemberDeclaration? {
         if (isVar) return null
-        return overriddenSymbols.find { (it.fir as? FirProperty)?.isVar == true }?.fir?.safeAs()
+        return overriddenSymbols.find { (it.fir as? FirProperty)?.isVar == true }?.fir as? FirMemberDeclaration?
     }
 
     private fun FirCallableMemberDeclaration.checkVisibility(
@@ -178,7 +178,7 @@ object FirOverrideChecker : FirClassChecker() {
                     AbstractTypeChecker.isSubtypeOf(typeCheckerContext, overridingReturnType, overriddenReturnType)
 
             if (!isReturnTypeOkForOverride) {
-                return overriddenDeclaration.safeAs()
+                return overriddenDeclaration as? FirMemberDeclaration
             }
         }
 

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/expression/FirUpperBoundViolatedExpressionChecker.kt

@@ -29,7 +29,7 @@ object FirUpperBoundViolatedExpressionChecker : FirQualifiedAccessExpressionChec
         val calleReference = expression.calleeReference
         var calleeFir: FirTypeParameterRefsOwner? = null
         if (calleReference is FirResolvedNamedReference) {
-            calleeFir = calleReference.safeAs<FirResolvedNamedReference>()?.resolvedSymbol?.fir.safeAs()
+            calleeFir = calleReference.safeAs<FirResolvedNamedReference>()?.resolvedSymbol?.fir as? FirTypeParameterRefsOwner
         } else if (calleReference is FirErrorNamedReference) {
             val diagnostic = calleReference.diagnostic
             if (diagnostic is ConeInapplicableCandidateError &&
@@ -37,7 +37,7 @@ object FirUpperBoundViolatedExpressionChecker : FirQualifiedAccessExpressionChec
             ) {
                 return
             }
-            calleeFir = calleReference.candidateSymbol?.fir.safeAs()
+            calleeFir = calleReference.candidateSymbol?.fir as? FirTypeParameterRefsOwner
         }
 
         var typeArguments: List<Any>? = null
@@ -61,4 +61,4 @@ object FirUpperBoundViolatedExpressionChecker : FirQualifiedAccessExpressionChec
             typeArgumentRefsAndSources
         )
     }
-}
+}

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/coneDiagnosticToFirDiagnostic.kt

@@ -66,7 +66,7 @@ private fun ConeDiagnostic.toFirDiagnostic(
         is FirBackingFieldSymbol -> FirErrors.VAL_REASSIGNMENT_VIA_BACKING_FIELD_ERROR.createOn(source, symbol.fir.symbol)
         else -> FirErrors.VAL_REASSIGNMENT.createOn(source, symbol)
     }
-    is ConeUnexpectedTypeArgumentsError -> FirErrors.TYPE_ARGUMENTS_NOT_ALLOWED.createOn(this.source.safeAs() ?: source)
+    is ConeUnexpectedTypeArgumentsError -> FirErrors.TYPE_ARGUMENTS_NOT_ALLOWED.createOn(this.source as? FirSourceElement ?: source)
     is ConeIllegalAnnotationError -> FirErrors.NOT_AN_ANNOTATION_CLASS.createOn(source, this.name.asString())
     is ConeWrongNumberOfTypeArgumentsError ->
         FirErrors.WRONG_NUMBER_OF_TYPE_ARGUMENTS.createOn(qualifiedAccessSource ?: source, this.desiredCount, this.type)

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/declarations/deprecationUtils.kt

@@ -88,7 +88,7 @@ private fun <T : FirAnnotatedDeclaration> T.getDeprecationForCallSite(
 
 private fun FirAnnotationCall.getStringArgument(name: Name): String? =
     findArgumentByName(name)?.let { expression ->
-        expression.safeAs<FirConstExpression<*>>()?.value.safeAs()
+        expression.safeAs<FirConstExpression<*>>()?.value as? String
     }
 
 private fun FirAnnotationCall.getVersionFromArgument(name: Name): ApiVersion? =