Revert "[clang-repl] Allow passing in code as positional arguments."

This reverts commit e386871e1d21cf206a1287356e88c5853563fc77.

Reason: Broke the ASan buildbots
(https://lab.llvm.org/buildbot/#/builders/5/builds/9291). See comments
on https://reviews.llvm.org/D104898 for more information.

llvm-monorepo: 3ec88ca60b24418b2216de88fad1da4f269f6b8c

Author: hctim

test/Interpreter/execute.cpp

@@ -1,12 +1,7 @@
-// RUN: clang-repl "int i = 10;" 'extern "C" int printf(const char*,...);' \
-// RUN:            'auto r1 = printf("i = %d\n", i);' | FileCheck --check-prefix=CHECK-DRIVER %s
+// RUN: cat %s | clang-repl | FileCheck %s
 // REQUIRES: host-supports-jit
 // UNSUPPORTED: system-aix
 
-// CHECK-DRIVER: i = 10
-
-// RUN: cat %s | clang-repl | FileCheck %s
-
 extern "C" int printf(const char *, ...);
 int i = 42;
 auto r1 = printf("i = %d\n", i);

tools/clang-repl/ClangRepl.cpp

@@ -28,9 +28,6 @@ static llvm::cl::list<std::string>
               llvm::cl::CommaSeparated);
 static llvm::cl::opt<bool> OptHostSupportsJit("host-supports-jit",
                                               llvm::cl::Hidden);
-static llvm::cl::list<std::string> OptInputs(llvm::cl::Positional,
-                                             llvm::cl::ZeroOrMore,
-                                             llvm::cl::desc("[code to run]"));
 
 static void LLVMErrorHandler(void *UserData, const std::string &Message,
                              bool GenCrashDiag) {
@@ -81,22 +78,15 @@ int main(int argc, const char **argv) {
                                     static_cast<void *>(&CI->getDiagnostics()));
 
   auto Interp = ExitOnErr(clang::Interpreter::create(std::move(CI)));
-  for (const std::string &input : OptInputs) {
-    if (auto Err = Interp->ParseAndExecute(input))
+  llvm::LineEditor LE("clang-repl");
+  // FIXME: Add LE.setListCompleter
+  while (llvm::Optional<std::string> Line = LE.readLine()) {
+    if (*Line == "quit")
+      break;
+    if (auto Err = Interp->ParseAndExecute(*Line))
       llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
   }
 
-  if (OptInputs.empty()) {
-    llvm::LineEditor LE("clang-repl");
-    // FIXME: Add LE.setListCompleter
-    while (llvm::Optional<std::string> Line = LE.readLine()) {
-      if (*Line == "quit")
-        break;
-      if (auto Err = Interp->ParseAndExecute(*Line))
-        llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(), "error: ");
-    }
-  }
-
   // Our error handler depends on the Diagnostics object, which we're
   // potentially about to delete. Uninstall the handler now so that any
   // later errors use the default handling behavior instead.