[flang] Extract hlfir.assign inlining from opt-bufferization. (#121544) Optimized bufferization can transform hlfir.assign into a loop nest doing element per element assignment, but it avoids doing so for RHS that is hlfir.expr. This is done to let ElementalAssignBufferization pattern to try to do a better job. This patch moves the hlfir.assign inlining after opt-bufferization, and enables it for hlfir.expr RHS. The hlfir.expr RHS cases are present in tonto, and this patch results in some nice improvements. Note that those cases are handled by other compilers also using array temporaries, so this patch seems to just get rid of the Assign runtime overhead/inefficiency.
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