[Support] Make error banner optional in logAllUnhandledErrors

In a lot of places an empty string was passed as the ErrorBanner to
logAllUnhandledErrors. This patch makes that argument optional to
simplify the call sites.

llvm-svn: 346604
diff --git a/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp b/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
index eb57589..4b823b8 100644
--- a/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
+++ b/llvm/tools/llvm-readobj/ARMWinEHPrinter.cpp
@@ -903,7 +903,7 @@
     if (!Name) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(Name.takeError(), OS, "");
+      logAllUnhandledErrors(Name.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
@@ -942,7 +942,7 @@
     if (!FunctionNameOrErr) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS, "");
+      logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
@@ -951,7 +951,7 @@
     if (!FunctionAddressOrErr) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS, "");
+      logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
@@ -967,7 +967,7 @@
     if (!Name) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(Name.takeError(), OS, "");
+      logAllUnhandledErrors(Name.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
@@ -976,7 +976,7 @@
     if (!AddressOrErr) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(AddressOrErr.takeError(), OS, "");
+      logAllUnhandledErrors(AddressOrErr.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
@@ -1025,7 +1025,7 @@
     if (!FunctionNameOrErr) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS, "");
+      logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
@@ -1034,7 +1034,7 @@
     if (!FunctionAddressOrErr) {
       std::string Buf;
       llvm::raw_string_ostream OS(Buf);
-      logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS, "");
+      logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS);
       OS.flush();
       report_fatal_error(Buf);
     }
diff --git a/llvm/tools/llvm-readobj/llvm-readobj.h b/llvm/tools/llvm-readobj/llvm-readobj.h
index 374ffd0..73eee76 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.h
+++ b/llvm/tools/llvm-readobj/llvm-readobj.h
@@ -40,7 +40,7 @@
       return *EO;
     std::string Buf;
     raw_string_ostream OS(Buf);
-    logAllUnhandledErrors(EO.takeError(), OS, "");
+    logAllUnhandledErrors(EO.takeError(), OS);
     OS.flush();
     reportError(Buf);
   }