x86: Disallow -mindirect-branch=/-mfunction-return= with -mcmodel=large

x86: Disallow -mindirect-branch=/-mfunction-return= with -mcmodel=large

Since the thunk function may not be reachable in large code model,
-mcmodel=large is incompatible with -mindirect-branch=thunk,
-mindirect-branch=thunk-extern, -mfunction-return=thunk and
-mfunction-return=thunk-extern.  Issue an error when they are used with
-mcmodel=large.

gcc/

	* config/i386/i386.c (ix86_set_indirect_branch_type): Disallow
	-mcmodel=large with -mindirect-branch=thunk,
	-mindirect-branch=thunk-extern, -mfunction-return=thunk and
	-mfunction-return=thunk-extern.
	* doc/invoke.texi: Document -mcmodel=large is incompatible with
	-mindirect-branch=thunk, -mindirect-branch=thunk-extern,
	-mfunction-return=thunk and -mfunction-return=thunk-extern.

gcc/testsuite/

	* gcc.target/i386/indirect-thunk-10.c: New test.
	* gcc.target/i386/indirect-thunk-8.c: Likewise.
	* gcc.target/i386/indirect-thunk-9.c: Likewise.
	* gcc.target/i386/indirect-thunk-attr-10.c: Likewise.
	* gcc.target/i386/indirect-thunk-attr-11.c: Likewise.
	* gcc.target/i386/indirect-thunk-attr-9.c: Likewise.
	* gcc.target/i386/ret-thunk-17.c: Likewise.
	* gcc.target/i386/ret-thunk-18.c: Likewise.
	* gcc.target/i386/ret-thunk-19.c: Likewise.
	* gcc.target/i386/ret-thunk-20.c: Likewise.
	* gcc.target/i386/ret-thunk-21.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@256664 138bc75d-0d04-0410-961f-82ee72b054a4