powerpc/64: allow compiler to cache 'current'

current may be cached by the compiler, so remove the volatile asm
restriction. This results in better generated code, as well as being
smaller and fewer dependent loads, it can avoid store-hit-load flushes
like this one that shows up in irq_exit():

    preempt_count_sub(HARDIRQ_OFFSET);
    if (!in_interrupt() && ...)

Which ends up as:

    ((struct thread_info *)current)->preempt_count -= HARDIRQ_OFFSET;
    if (((struct thread_info *)current)->preempt_count ...

Evaluating current twice presently means it has to be loaded twice, and
here gcc happens to pick a different register each time, then
preempt_count is accessed via that base register:

    1058:       ld      r10,2392(r13)     <-- current
    105c:       lwz     r9,0(r10)         <-- preempt_count
    1060:       addis   r9,r9,-1
    1064:       stw     r9,0(r10)         <-- preempt_count
    1068:       ld      r9,2392(r13)      <-- current
    106c:       lwz     r9,0(r9)          <-- preempt_count
    1070:       rlwinm. r9,r9,0,11,23
    1074:       bne     1090 <irq_exit+0x60>

This can frustrate store-hit-load detection heuristics and cause
flushes. Allowing the compiler to cache current in a reigster with this
patch results in the same base register being used for all accesses,
which is more likely to be detected as an alias:

    1058:       ld      r31,2392(r13)
    ...
    1070:       lwz     r9,0(r31)
    1074:       addis   r9,r9,-1
    1078:       stw     r9,0(r31)
    107c:       lwz     r9,0(r31)
    1080:       rlwinm. r9,r9,0,11,23
    1084:       bne     10a0 <irq_exit+0x60>

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190612140317.24490-1-npiggin@gmail.com