Allow user to configure if free is allowed at runtime.

Antonio Sánchezrequested to merge
cantonios/eigen:malloc into master

Description

Allow user to configure if free is allowed at runtime.

Reverts to Eigen 3.4 behavior by default, where free(...) is allowed if EIGEN_RUNTIME_NO_MALLOC is defined but set_is_malloc_allowed(true). Adds a separate set_is_free_allowed(...) to explicitly control use of std::free.

Reference issue

Fixes #2983 (closed).

Additional information

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