m2rte.cc reduce include headers and correct build dependencies.

m2rte.cc reduce include headers and correct build dependencies.

2022-05-16   Gaius Mulley   <gaius.mulley@southwales.ac.uk>

This patch corrects the dependencies to build m2rte.so in
Make-lang.in.  It also reduces the number of headers used in
m2rte.cc.

gcc/m2/ChangeLog:

	* plugin/m2rte.cc (alias.h, predict.h, tm.h,
	stringpool.h, toplev.h, basic-block.h, hash-table.h,
	vec.h, ggc.h, basic-block.h, tree-ssa-alias.h,
	internal-fn.h, gimple-fold.h, tree-eh.h, gimple-expr.h,
	is-a.h):  Header file includes removed.
	(plugin/m2rte$(exeext).so) Make dependent upon
	$(GCC_HEADER_DEPENDENCIES_FOR_M2) and insn-addr-common.h.

Signed-off-by: Gaius Mulley <gaius.mulley@southwales.ac.uk>