Factor out switch statement into a helper function (NFC)

This addresses post-commit review feedback for https://reviews.llvm.org/D62015.

llvm-svn: 360930
diff --git a/lldb/source/Target/Language.cpp b/lldb/source/Target/Language.cpp
index 71a54b8..a1a388d 100644
--- a/lldb/source/Target/Language.cpp
+++ b/lldb/source/Target/Language.cpp
@@ -273,6 +273,24 @@
   }
 }
 
+bool Language::LanguageIsCFamily(LanguageType language) {
+  switch (language) {
+  case eLanguageTypeC:
+  case eLanguageTypeC89:
+  case eLanguageTypeC99:
+  case eLanguageTypeC11:
+  case eLanguageTypeC_plus_plus:
+  case eLanguageTypeC_plus_plus_03:
+  case eLanguageTypeC_plus_plus_11:
+  case eLanguageTypeC_plus_plus_14:
+  case eLanguageTypeObjC_plus_plus:
+  case eLanguageTypeObjC:
+    return true;
+  default:
+    return false;
+  }
+}
+
 bool Language::LanguageIsPascal(LanguageType language) {
   switch (language) {
   case eLanguageTypePascal83: