C++: Inline often used member functions of TranslationUnit

As indicated by profiling.

Change-Id: I92d79b52d2d56540da39559fe4db3c22ab53a73a
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/3rdparty/cplusplus/TranslationUnit.cpp

@@ -108,15 +108,6 @@ void TranslationUnit::setSource(const char *source, unsigned size)
     _lastSourceChar = source + size;
 }
 
-unsigned TranslationUnit::tokenCount() const
-{ return _tokens->size(); }
-
-const Token &TranslationUnit::tokenAt(unsigned index) const
-{ return _tokens->at(index); }
-
-int TranslationUnit::tokenKind(unsigned index) const
-{ return _tokens->at(index).f.kind; }
-
 const char *TranslationUnit::spell(unsigned index) const
 {
     if (! index)

src/libs/3rdparty/cplusplus/TranslationUnit.h

@@ -52,9 +52,12 @@ public:
 
     void setSource(const char *source, unsigned size);
 
-    unsigned tokenCount() const;
-    const Token &tokenAt(unsigned index) const;
-    int tokenKind(unsigned index) const;
+    unsigned tokenCount() const
+        { return _tokens->size(); }
+    const Token &tokenAt(unsigned index) const
+        { return _tokens->at(index); }
+    int tokenKind(unsigned index) const
+        { return _tokens->at(index).f.kind; }
     const char *spell(unsigned index) const;
 
     unsigned commentCount() const;