IRGen: re-enable generate static arrays in read-only data sections. #59612
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So far, static arrays had to be put into a writable section, because the isa pointer and the (immortal) ref count field were initialized dynamically at the first use of such an array. But with a new runtime library, which exports the symbols for the (immortal) ref count field and the isa pointer, it's possible to put the whole array into a read-only section. I.e. make it a constant global. rdar://94185998 This reverts the revert commit df353ff. Also, I added a frontend option to disable this optimization: `-disable-readonly-static-objects`
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So far, static arrays had to be put into a writable section, because the isa pointer and the (immortal) ref count field were initialized dynamically at the first use of such an array.
But with a new runtime library, which exports the symbols for the (immortal) ref count field and the isa pointer, it's possible to put the whole array into a read-only section. I.e. make it a constant global.
rdar://94185998
This reverts the revert commit df353ff.
Also, I added a frontend option to disable this optimization:
-disable-readonly-static-objects