musl: Add mimalloc as a possible malloc implementation

Add mimalloc as an alternative malloc implementation and use it. This closes glibc's malloc performance advantage over musl and in some situations makes more efficient use of memory.

In testing, mimalloc outperformed mallocng, jemalloc and dlmalloc. Not yet tested: Bionic malloc

Signed-off-by: Bernhard Rosenkränzer bernhard.rosenkraenzer.ext@huawei.com

changed milestone to %goofy beta

added teamtoolchain label

assigned to @bero

mentioned in issue #601 (closed)

added 29 commits

• c4719fab...85c0c66b - 28 commits from branch eclipse/oniro-core:kirkstone
• ba304ce7 - musl: Add mimalloc as a possible malloc implementation

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@bero This is missing a statement on why mimalloc is needed? Used by some package?

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