[ORE] Use LLVM's "diagnostics hotness" spelling

[modocache]

Summary

Depends on https://reviews.llvm.org/D34864.

To unify Clang and LLVM's spelling of "diagnostic[s] hotness", use the
new "diagnostics hotness" spelling in LLVM, which was added in
https://reviews.llvm.org/D34864.

[anemet]

LGTM, thanks!

lib/CodeGen/CodeGenAction.cpp

IRGenFinished = true;
         Ctx.getInlineAsmDiagnosticHandler();
       void *OldContext = Ctx.getInlineAsmDiagnosticContext();
       Ctx.setInlineAsmDiagnosticHandler(InlineAsmDiagHandler, this);
 
       LLVMContext::DiagnosticHandlerTy OldDiagnosticHandler =
           Ctx.getDiagnosticHandler();
       void *OldDiagnosticContext = Ctx.getDiagnosticContext();
       Ctx.setDiagnosticHandler(DiagnosticHandler, this);
-      Ctx.setDiagnosticHotnessRequested(CodeGenOpts.DiagnosticsWithHotness);
+      Ctx.setDiagnosticsHotnessRequested(CodeGenOpts.DiagnosticsWithHotness);
 
       std::unique_ptr<llvm::tool_output_file> OptRecordFile;
       if (!CodeGenOpts.OptRecordFile.empty()) {
         std::error_code EC;
         OptRecordFile =
           llvm::make_unique<llvm::tool_output_file>(CodeGenOpts.OptRecordFile,
                                                     EC, sys::fs::F_None);
         if (EC) {
           Diags.Report(diag::err_cannot_open_file) <<
             CodeGenOpts.OptRecordFile << EC.message();
           return;
         }
 
         Ctx.setDiagnosticsOutputFile(
             llvm::make_unique<yaml::Output>(OptRecordFile->os()));
 
         if (CodeGenOpts.getProfileUse() != CodeGenOptions::ProfileNone)
-          Ctx.setDiagnosticHotnessRequested(true);
+          Ctx.setDiagnosticsHotnessRequested(true);
       }
 
       // Link each LinkModule into our module.
       if (LinkInModules())
         return;
 
       EmbedBitcode(getModule(), CodeGenOpts, llvm::MemoryBufferRef());