[flang] [LLVMify F18] Replace the use std::ostream with LLVM streams llvm::ostream

This patch replaces the occurrence of std::ostream by llvm::raw_ostream.
In  LLVM Coding Standards[1] "All new code should use raw_ostream
instead of ostream".[1]

As a consequence, this patch also replaces the use of:
   std::stringstream by llvm::raw_string_ostream or llvm::raw_ostream*
   std::ofstream by llvm::raw_fd_ostream
   std::endl by '\n' and flush()[2]
   std::cout by llvm::outs()   and
   std::cerr by llvm::errs()

It also replaces  std::strerro by llvm::sys::StrError** , but NOT in  Fortran
runtime libraries

*std::stringstream were replaced by llvm::raw_ostream in all methods that
used std::stringstream as a parameter. Moreover, it removes the pointers to
these streams.

[1]https://llvm.org/docs/CodingStandards.html
[2]https://releases.llvm.org/2.5/docs/CodingStandards.html#ll_avoidendl

Signed-off-by: Caroline Concatto <caroline.concatto@arm.com>

Running clang-format-7

Signed-off-by: Caroline Concatto <caroline.concatto@arm.com>

Removing residue of ostream library

Signed-off-by: Caroline Concatto <caroline.concatto@arm.com>

Original-commit: flang-compiler/f18@a3507d44b8911e6024033aa583c1dc54e0eb89fd
Reviewed-on: https://github.com/flang-compiler/f18/pull/1047

1 files changed, 3 insertions, 2 deletions

diff --git a/flang/lib/Parser/token-sequence.cpp b/flang/lib/Parser/token-sequence.cpp
index 23aa450..235a4a4 100644
--- a/flang/lib/Parser/token-sequence.cpp
+++ b/flang/lib/Parser/token-sequence.cpp
@@ -8,6 +8,7 @@
 
 #include "token-sequence.h"
 #include "flang/Parser/characters.h"
+#include "llvm/Support/raw_ostream.h"
 
 namespace Fortran::parser {
 
@@ -123,7 +124,7 @@ void TokenSequence::Put(const std::string &s, Provenance provenance) {
   Put(s.data(), s.size(), provenance);
 }
 
-void TokenSequence::Put(const std::stringstream &ss, Provenance provenance) {
+void TokenSequence::Put(llvm::raw_string_ostream &ss, Provenance provenance) {
   Put(ss.str(), provenance);
 }
 
@@ -248,7 +249,7 @@ void TokenSequence::Emit(CookedSource &cooked) const {
   cooked.PutProvenanceMappings(provenances_);
 }
 
-void TokenSequence::Dump(std::ostream &o) const {
+void TokenSequence::Dump(llvm::raw_ostream &o) const {
   o << "TokenSequence has " << char_.size() << " chars; nextStart_ "
     << nextStart_ << '\n';
   for (std::size_t j{0}; j < start_.size(); ++j) {