[TargetInstrInfo] enable foldMemoryOperand for InlineAsm (#70743)

foldMemoryOperand looks at pairs of instructions (generally a load to
virt reg then use of the virtreg, or def of a virtreg then a store) and
attempts to combine them.  This can reduce register pressure.

A prior commit added the ability to mark such a MachineOperand as
foldable. In terms of INLINEASM, this means that "rm" was used (rather
than just "r") to denote that the INLINEASM may use a memory operand
rather than a register operand. This effectively undoes decisions made
by the instruction selection framework.  Callers will be added in the
register allocation frameworks. This has been tested with all of the
above (which will come as follow up patches).

Thanks to @topperc who suggested this at last years LLVM US Dev Meeting
and @qcolombet who confirmed this was the right approach.

Link: https://github.com/llvm/llvm-project/issues/20571