Revert "compiler-gcc: disable -ftracer for __noclone functions"

The -ftracer optimization was disabled in __noclone as a workaround to
GCC duplicating a blob of inline assembly that happened to define a
global variable.  It has been pointed out that no amount of workarounds
can guarantee the compiler won't duplicate inline assembly[1], and that
disabling the -ftracer optimization has several unintended and nasty
side effects[2][3].

Now that the offending KVM code which required the workaround has
been properly fixed and no longer uses __noclone, remove the -ftracer
optimization tweak from __noclone.

[1] https://lore.kernel.org/lkml/[email protected]/T/#u
[2] https://lore.kernel.org/lkml/20181218140105.ajuiglkpvstt3qxs@treble/T/#u
[3] https://patchwork.kernel.org/patch/8707981/#21817015

This reverts commit 95272c29378ee7dc15f43fa2758cb28a5913a06d.

Suggested-by: Andi Kleen <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Nadav Amit <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Martin Jambor <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Miroslav Benes <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: Andi Kleen <[email protected]>
Reviewed-by: Miguel Ojeda <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

0 files changed, 0 insertions, 0 deletions