[flang] Fix Boolean flag arguments

[klausler]

Summary

Two sites in io-api.cpp pass the wrong Boolean flag value to
signify that a new anonymous unit is a formatted file.

[sscalpone]

Builds and passed tests for me.

flang/runtime/buffer.h

if (newFrame < 0 || newFrame > length_) {
       frame_ = newFrame;
     }
     RUNTIME_CHECK(handler, at == fileOffset_ + frame_);
     if (static_cast<std::int64_t>(start_ + frame_ + bytes) > size_) {
       DiscardLeadingBytes(frame_, handler);
       MakeDataContiguous(handler, bytes);
       RUNTIME_CHECK(handler, at == fileOffset_ + frame_);
     }
-    while (FrameLength() < bytes) {
+    if (FrameLength() < bytes) {
       auto next{start_ + length_};
       RUNTIME_CHECK(handler, next < size_);
       auto minBytes{bytes - FrameLength()};
       auto maxBytes{size_ - next};
       auto got{Store().Read(
           fileOffset_ + length_, buffer_ + next, minBytes, maxBytes, handler)};
       length_ += got;
       RUNTIME_CHECK(handler, length_ <= size_);
-      if (got < minBytes) {
-        break; // error or EOF & program can handle it
-      }
     }
     return FrameLength();
   }
 
   void WriteFrame(FileOffset at, std::size_t bytes, IoErrorHandler &handler) {
     Reallocate(bytes, handler);
     std::int64_t newFrame{at - fileOffset_};
     if (!dirty_ || newFrame < 0 || newFrame > length_) {

flang/runtime/io-api.cpp

Cookie IONAME(BeginBackspace)(
   return &unit.BeginIoStatement<ExternalMiscIoStatementState>(
       unit, ExternalMiscIoStatementState::Backspace, sourceFile, sourceLine);
 }
 
 Cookie IONAME(BeginEndfile)(
     ExternalUnit unitNumber, const char *sourceFile, int sourceLine) {
   Terminator terminator{sourceFile, sourceLine};
   ExternalFileUnit &unit{ExternalFileUnit::LookUpOrCreateAnonymous(
-      unitNumber, Direction::Output, true /*formatted*/, terminator)};
+      unitNumber, Direction::Output, false /*formatted*/, terminator)};
   return &unit.BeginIoStatement<ExternalMiscIoStatementState>(
       unit, ExternalMiscIoStatementState::Endfile, sourceFile, sourceLine);
 }
 
 Cookie IONAME(BeginRewind)(
     ExternalUnit unitNumber, const char *sourceFile, int sourceLine) {
   Terminator terminator{sourceFile, sourceLine};
   ExternalFileUnit &unit{ExternalFileUnit::LookUpOrCreateAnonymous(
-      unitNumber, Direction::Input, true /*formatted*/, terminator)};
+      unitNumber, Direction::Input, false /*formatted*/, terminator)};
   return &unit.BeginIoStatement<ExternalMiscIoStatementState>(
       unit, ExternalMiscIoStatementState::Rewind, sourceFile, sourceLine);
 }
 
 Cookie IONAME(BeginInquireUnit)(
     ExternalUnit unitNumber, const char *sourceFile, int sourceLine) {
   if (ExternalFileUnit * unit{ExternalFileUnit::LookUp(unitNumber)}) {
     return &unit->BeginIoStatement<InquireUnitState>(