PowerPC64 sysdep.h tidy

.align on some targets takes a byte alignment, on others like powerpc,
log2 of the byte alignment.  It's a good idea to avoid .align,
particularly since x86 and powerpc are different.  This patch fixes
the occurrences of .align in powerpc64/sysdep.h, renames DOT_LABEL
since the macro doesn't have anything to do with adding dots, removes
extraneous semicolons, and fixes some formatting.

	* sysdeps/powerpc/powerpc64/sysdep.h: Formatting.
	(FUNC_LABEL): Rename from DOT_LABEL.
	(ENTRY_1): Use FUNC_LABEL and remove leading space from label.
	Use .p2align rather than .align.
	(TRACEBACK, TRACEBACK_MASK): Use .p2align rather than .align.
	(ABORT_TRANSACTION): Likewise.
	(ENTRY_1, ENTRY_2, END_2, LOCALENTRY): Remove unnecessary semicolons,
	particularly at end.  Add semicolon at invocation as necessary.
	(TRACEBACK, TRACEBACK_MASK, PSEUDO, PSEUDO_NOERRNO): Likewise.
	(PSEUDO_ERRVAL, PPC64_LOAD_FUNCPTR, OPD_ENT): Likewise.
	* sysdeps/powerpc/powerpc64/multiarch/strrchr-power8.S (ENTRY,
	END): Adjust to suit.