This PR just tags all assembly blocks as memory-safe. Non-memory-safe assembly causes the Solidity compiler to disallow some Yul optimizations for the entire compilation unit.

I checked when marking the assembly blocks and I believe that they are all memory-safe (just not tagged as such).

For reference, assembly is considered memory-safe if (reference:

• Memory allocated by yourself using a mechanism like the allocate function described above.
• Memory allocated by Solidity, e.g. memory within the bounds of a memory array you reference.
• The scratch space between memory offset 0 and 64 mentioned above.
• Temporary memory that is located after the value of the free memory pointer at the beginning of the assembly block, i.e. memory that is “allocated” at the free memory pointer without updating the free memory pointer.