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runtime: malloc flags should be subsumed by the type information provided to mallogc #6237
Today, we pass flags to malloc to help it decide what constraints are required on the storage allocated for an object. However, all of this information can be derrived from the type of an object. For example, instead of passing the "not pointers" flag mallocgc can do a "no pointers" allocation whenever it is passed a type which contains no point values. There are some flags which cannot be subsumed by the type information, this includes the zeroing flag (sometimes we know we are going to initialize an object and do not need zeroing) and the no invoke gc flag. The "no gc" flag is a gray area, in theory types could encode this information (for example, mspans, stacks) but today those kinds of allocation have no type. Maybe they should.