User:Legalize/Refactorings

• Replace malloc + memset with calloc
• Replace malloc(X*Y) with reallocarray(X, Y)

Clang Matchers

• Match return expression on returnStmt
• Extend hasParameter to FunctionProtoType nodes
• Extend returns to FunctionProtoType nodes
• Extend parameterCountIs to FunctionProtoType nodes
• Extend hasAnyParameter to FunctionProtoType nodes
• Match statement ordering in a compoundStmt block