[LLDB] Add minimal support for the new Mojo language

Modular just announced a new language called Mojo. This patch adds an entry in the language list in LLDB for minimal support (e.g. being able to create a TypeSystem for this language). We will later add debug info entries when the language matures.

lldb/docs/python_api_enums.rst

@@ -731,6 +731,7 @@ LanguageType
 .. py:data:: eLanguageTypeFortran03
 .. py:data:: eLanguageTypeFortran08
 .. py:data:: eLanguageTypeMipsAssembler
+.. py:data:: eLanguageTypeMojo
 .. py:data:: eLanguageTypeExtRenderScript
 .. py:data:: eNumLanguageTypes
 

lldb/include/lldb/lldb-enumerations.h

@@ -497,6 +497,9 @@ enum LanguageType {
   // Language::SetLanguageFromCString and Language::AsCString assume these can
   // be used as indexes into array g_languages.
   eLanguageTypeMipsAssembler,           ///< Mips_Assembler.
+  // Mojo will move to the common list of languages once the DWARF committee
+  // creates a language code for it.
+  eLanguageTypeMojo,
   eNumLanguageTypes
 };
 

lldb/source/Target/Language.cpp

@@ -211,6 +211,7 @@ struct language_name_pair language_names[] = {
     {"ada2012", eLanguageTypeAda2012},
     // Vendor Extensions
     {"assembler", eLanguageTypeMipsAssembler},
+    {"mojo", eLanguageTypeMojo},
     // Now synonyms, in arbitrary order
     {"objc", eLanguageTypeObjC},
     {"objc++", eLanguageTypeObjC_plus_plus},