Revert "[clang][dataflow] Don't crash when caller args are missing storage locations"

https://lab.llvm.org/buildbot/#/builders/74/builds/12713

This reverts commit 43b298ea12.

clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h

@@ -140,6 +140,8 @@ public:
   ///  The body of the callee must not reference globals.
   ///
   ///  The arguments of `Call` must map 1:1 to the callee's parameters.
+  ///
+  ///  Each argument of `Call` must already have a `StorageLocation`.
   Environment pushCall(const CallExpr *Call) const;
   Environment pushCall(const CXXConstructExpr *Call) const;
 

clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp

@@ -253,8 +253,7 @@ void Environment::pushCallInternal(const FunctionDecl *FuncDecl,
 
     const Expr *Arg = Args[ArgIndex];
     auto *ArgLoc = getStorageLocation(*Arg, SkipPast::Reference);
-    if (ArgLoc == nullptr)
-      continue;
+    assert(ArgLoc != nullptr);
 
     const VarDecl *Param = *ParamIt;
     auto &Loc = createStorageLocation(*Param);

clang/unittests/Analysis/FlowSensitive/TransferTest.cpp

@@ -4229,27 +4229,6 @@ TEST(TransferTest, ContextSensitiveReturnArg) {
                /*.BuiltinTransferOptions=*/{/*.ContextSensitive=*/true}});
 }
 
-TEST(TransferTest, ContextSensitiveReturnInt) {
-  std::string Code = R"(
-    int identity(int x) { return x; }
-
-    void target() {
-      int y = identity(42);
-      // [[p]]
-    }
-  )";
-  runDataflow(Code,
-              [](llvm::ArrayRef<
-                     std::pair<std::string, DataflowAnalysisState<NoopLattice>>>
-                     Results,
-                 ASTContext &ASTCtx) {
-                ASSERT_THAT(Results, ElementsAre(Pair("p", _)));
-                // This just tests that the analysis doesn't crash.
-              },
-              {/*.ApplyBuiltinTransfer=*/true,
-               /*.BuiltinTransferOptions=*/{/*.ContextSensitive=*/true}});
-}
-
 TEST(TransferTest, ContextSensitiveMethodLiteral) {
   std::string Code = R"(
     class MyClass {