Clean up memory allocation and unexec support on MS-Windows
* src/w32heap.c (report_temacs_memory_usage): Condition on !CANNOT_DUMP, in addition to ENABLE_CHECKING. (init_heap): Accept an argument, which tells us what heap allocation method to use. (DUMPED_HEAP_SIZE) [CANNOT_DUMP]: Define to a small value, as we don't use dumped_data in this case. * src/w32heap.h (init_heap): Adjust prototype. <using_dynamic_heap>: Remove declaration. * src/emacs.c (main) [WINDOWSNT]: Determine heap allocation method based on whether we are in temacs and whether unexec will be used to dump Emacs. Pass the heap allocation method to init_heap, which is now called after parsing the --temacs=METHOD option. * src/unexw32.c (unexec): Don't fiddle with using_dynamic_heap. <using_dynamic_heap>: Remove definition. * src/w32proc.c (malloc_before_init, realloc_before_init) (free_before_init): New functions, to catch memory allocation before heap allocation method is set up.
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