Remove redundant 'inline' keywords from definitions

Also add checks to t/t_dist_cppstyle

src/V3FileLine.h

@@ -247,7 +247,11 @@ public:
 
     // OPERATORS
     void v3errorEnd(std::ostringstream& str, const string& extra = "");
-    void v3errorEndFatal(std::ostringstream& str) VL_ATTR_NORETURN;
+    void v3errorEndFatal(std::ostringstream& str) VL_ATTR_NORETURN {
+        v3errorEnd(str);
+        assert(0);  // LCOV_EXCL_LINE
+        VL_UNREACHABLE
+    }
     /// When building an error, prefix for printing continuation lines
     /// e.g. information referring to the same FileLine as before
     string warnMore() const;
@@ -286,10 +290,4 @@ private:
 };
 std::ostream& operator<<(std::ostream& os, FileLine* fileline);
 
-inline void FileLine::v3errorEndFatal(std::ostringstream& str) {
-    v3errorEnd(str);
-    assert(0);  // LCOV_EXCL_LINE
-    VL_UNREACHABLE
-}
-
 #endif  // Guard