[ARC] Make char unsigned by default

Summary: This patch specifies 'char' default sign on ARC.

Reviewers: tatyana-krasnukha, clayborg

Reviewed By: tatyana-krasnukha, clayborg

Subscribers: clayborg, lldb-commits

Differential Revision: https://reviews.llvm.org/D51594

llvm-svn: 341667

lldb/source/Utility/ArchSpec.cpp

@@ -815,6 +815,7 @@ bool ArchSpec::CharIsSignedByDefault() const {
   case llvm::Triple::ppc64le:
   case llvm::Triple::systemz:
   case llvm::Triple::xcore:
+  case llvm::Triple::arc:
     return false;
   }
 }