[RFC] Prevent the scheduler from moving prefetch instructions when expanding __builtin_prefetch [PR 116713]

The prefetch instruction that is emitted by __builtin_prefetch is re-ordered on GCC, but not on clang[0]. GCC's behavior is surprising because when using the builtin you want the instruction to be placed at the exact point where you put it. Moving it around, specially across load/stores, may end

[PATCH] SH: Document extended asm operand modifers

From: Pietro Monteiro SH: Document extended asm operand modifers gcc/ChangeLog: * doc/extend.texi (SH Operand Modifiers): New. Signed-off-by: Pietro Monteiro --- Tested by running "make info pdf html" and looking at the pdf and html output. I used the comment on &