[Bug target/69734] no_caller_saved_registers attribute doesn't work with -mavx512f -g

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69734

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
A simpler testcase:

[hjl@gnu-6 interrupt-2]$ cat k.c
void
__attribute__((interrupt))
fn (void *frame)
{
  asm ("#"
       :
       :
       : "k1");
}
[hjl@gnu-6 interrupt-2]$ make k.o
/export/build/gnu/gcc-5/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-5/build-x86_64-linux/gcc/ -c -O2 -march=knl k.c
/tmp/cceKHse9.s: Assembler messages:
/tmp/cceKHse9.s:13: Error: register save offset not a multiple of 8
Makefile:29: recipe for target 'k.o' failed
make: *** [k.o] Error 1
[hjl@gnu-6 interrupt-2]$