[lldb][NFCI] Remove use of Stream * from TypeSystem

We always assume these streams are valid, might as well take references
instead of raw pointers.

Differential Revision: https://reviews.llvm.org/D154549

Author: bulbazord

lldb/include/lldb/Symbol/TypeSystem.h

@@ -385,14 +385,14 @@ class TypeSystem : public PluginInterface,
 #endif
 
   virtual void DumpValue(lldb::opaque_compiler_type_t type,
-                         ExecutionContext *exe_ctx, Stream *s,
+                         ExecutionContext *exe_ctx, Stream &s,
                          lldb::Format format, const DataExtractor &data,
                          lldb::offset_t data_offset, size_t data_byte_size,
                          uint32_t bitfield_bit_size,
                          uint32_t bitfield_bit_offset, bool show_types,
                          bool show_summary, bool verbose, uint32_t depth) = 0;
 
-  virtual bool DumpTypeValue(lldb::opaque_compiler_type_t type, Stream *s,
+  virtual bool DumpTypeValue(lldb::opaque_compiler_type_t type, Stream &s,
                              lldb::Format format, const DataExtractor &data,
                              lldb::offset_t data_offset, size_t data_byte_size,
                              uint32_t bitfield_bit_size,
@@ -409,7 +409,7 @@ class TypeSystem : public PluginInterface,
   /// source-like representation of the type, whereas eDescriptionLevelVerbose
   /// does a dump of the underlying AST if applicable.
   virtual void DumpTypeDescription(
-      lldb::opaque_compiler_type_t type, Stream *s,
+      lldb::opaque_compiler_type_t type, Stream &s,
       lldb::DescriptionLevel level = lldb::eDescriptionLevelFull) = 0;
 
   /// Dump a textual representation of the internal TypeSystem state to the
@@ -423,7 +423,7 @@ class TypeSystem : public PluginInterface,
   virtual bool IsRuntimeGeneratedType(lldb::opaque_compiler_type_t type) = 0;
 
   virtual void DumpSummary(lldb::opaque_compiler_type_t type,
-                           ExecutionContext *exe_ctx, Stream *s,
+                           ExecutionContext *exe_ctx, Stream &s,
                            const DataExtractor &data,
                            lldb::offset_t data_offset,
                            size_t data_byte_size) = 0;