Fix MSVC signed/unsigned conversion and size_t conversion warnings in LLDB

[hughbe]

Summary

I've been porting swift-lldb to Windows/MSVC, and encountered some size_t/unsigned implicit conversion warnings. I sent a PR (https://github.com/apple/swift-lldb/pull/161) and @jimingham suggested I push some of them here.

[hughbe]

Fix file names

[hughbe]

As per discussion on lists

lldb/trunk/source/Core/FormatEntity.cpp

 #define ENTRY_VALUE(n, t, f, v)                                                \
   {                                                                            \
     n, nullptr, FormatEntity::Entry::Type::t,                                  \
         FormatEntity::Entry::FormatType::f, v, 0, nullptr, false               \
   }
 #define ENTRY_CHILDREN(n, t, f, c)                                             \
   {                                                                            \
     n, nullptr, FormatEntity::Entry::Type::t,                                  \
-        FormatEntity::Entry::FormatType::f, 0, llvm::array_lengthof(c), c,     \
-        false                                                                  \
+        FormatEntity::Entry::FormatType::f, 0,                                 \
+        static_cast<uint32_t>(llvm::array_lengthof(c)), c, false               \
   }
 #define ENTRY_CHILDREN_KEEP_SEP(n, t, f, c)                                    \
   {                                                                            \
     n, nullptr, FormatEntity::Entry::Type::t,                                  \
-        FormatEntity::Entry::FormatType::f, 0, llvm::array_lengthof(c), c,     \
-        true                                                                   \
+        FormatEntity::Entry::FormatType::f, 0,                                 \
+        static_cast<uint32_t>(llvm::array_lengthof(c)), c, true                \
   }
 #define ENTRY_STRING(n, s)                                                     \
   {                                                                            \
     n, s, FormatEntity::Entry::Type::InsertString,                             \
         FormatEntity::Entry::FormatType::None, 0, 0, nullptr, false            \
   }
 static FormatEntity::Entry::Definition g_string_entry[] = {
     ENTRY("*", ParentString, None)};