Sparse release v0.5.1-rc1
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Merge branches 'dump-macros-v2', 'fix-predefined-size', 'fix-bool-context', 'fix-missing-reload', 'fix-insert-branch', 'fix-NULL-type', 'testsuite-clean', 'fix-bitfield-init-v3' and 'fdump-linearize' into tip

* fix missing reload
* fix boolean context for OP_AND_BOOL & OP_OR_BOOL
* fix bitfields implicit zero initializer.
* fix: kill old branch in insert_branch()
* returns the correct type when evaluating NULL
* use internal size for __INT_MAX__ & friends
* testsuite: cleanup result files
* add support for '-fdump-linearize[=only]'
* add support for '-fmem-report'
* add support for '-dD'

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>