[SystemZ][z/OS][TableGen] TableGen files should be text

[abhina.sreeskantharajan]

Summary

This patch sets tablegen files as text. It should have no effect on Windows after this patch landed https://reviews.llvm.org/rG82b3e28e836d2f5c8cfd6e1047b93c088522365a.

[anirudhp]

Changes LGTM. I'm assuming there's no additional dependencies for this patch?

[yroux]

LGTM as well

[abhina.sreeskantharajan]

In D100036#2674072, @anirudhp wrote:

Changes LGTM. I'm assuming there's no additional dependencies for this patch?

Correct, there are no dependencies

llvm/lib/TableGen/Main.cpp

int llvm::TableGenMain(const char *argv0, TableGenMainFn *MainFn) {
 
   if (TimePhases)
     Records.startPhaseTiming();
 
   // Parse the input file.
 
   Records.startTimer("Parse, build records");
   ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
-      MemoryBuffer::getFileOrSTDIN(InputFilename, /*IsText=*/false);
+      MemoryBuffer::getFileOrSTDIN(InputFilename, /*IsText=*/true);
   if (std::error_code EC = FileOrErr.getError())
     return reportError(argv0, "Could not open input file '" + InputFilename +
                                   "': " + EC.message() + "\n");
 
   Records.saveInputFilename(InputFilename);
 
   // Tell SrcMgr about this buffer, which is what TGParser will pick up.
   SrcMgr.AddNewSourceBuffer(std::move(*FileOrErr), SMLoc());
int llvm::TableGenMain(const char *argv0, TableGenMainFn *MainFn) {
 
   Records.startTimer("Write output");
   bool WriteFile = true;
   if (WriteIfChanged) {
     // Only updates the real output file if there are any differences.
     // This prevents recompilation of all the files depending on it if there
     // aren't any.
     if (auto ExistingOrErr =
-            MemoryBuffer::getFile(OutputFilename, /*IsText=*/false))
+            MemoryBuffer::getFile(OutputFilename, /*IsText=*/true))
       if (std::move(ExistingOrErr.get())->getBuffer() == Out.str())
         WriteFile = false;
   }
   if (WriteFile) {
     std::error_code EC;
     ToolOutputFile OutFile(OutputFilename, EC, sys::fs::OF_Text);
     if (EC)
       return reportError(argv0, "error opening " + OutputFilename + ": " +