powerpc: Add a #define for aligning to a long-sized boundary

Add a #define for aligning to a long-sized boundary. It would be nice
to use sizeof(long) for this, but that requires generating the value
with asm-offsets.c, and asm-offsets.c includes asm-compat.h and we
descend into some sort of recursive include hell.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

include/asm-powerpc/asm-compat.h

@@ -22,6 +22,7 @@
 #define PPC_STL		stringify_in_c(std)
 #define PPC_LCMPI	stringify_in_c(cmpdi)
 #define PPC_LONG	stringify_in_c(.llong)
+#define PPC_LONG_ALIGN	stringify_in_c(.balign 8)
 #define PPC_TLNEI	stringify_in_c(tdnei)
 #define PPC_LLARX	stringify_in_c(ldarx)
 #define PPC_STLCX	stringify_in_c(stdcx.)
@@ -43,6 +44,7 @@
 #define PPC_STL		stringify_in_c(stw)
 #define PPC_LCMPI	stringify_in_c(cmpwi)
 #define PPC_LONG	stringify_in_c(.long)
+#define PPC_LONG_ALIGN	stringify_in_c(.balign 4)
 #define PPC_TLNEI	stringify_in_c(twnei)
 #define PPC_LLARX	stringify_in_c(lwarx)
 #define PPC_STLCX	stringify_in_c(stwcx.)