Move most libmvec test contents from .c to .h files.

The libmvec tests put substantive, architecture-specific contents in
.c files such as test-double-vlen4.c, so making those files
architecture-specific and causing issues for generating such files
automatically when splitting up tests by function.

This patch moves all the substantive contents to .h files, so the .c
files only include the .h file and then libm-test.c.  This allows for
automatic generation of per-function .c files in future.  The .h files
in turn #include or #include_next the architecture-independent file
and add the architecture-specific definitions to that.  (Splitting by
function should in fact allow the TEST_VECTOR_* macros to be replaced
by sysdeps makefile information on which functions to test in each
case, removing the need for gen-libm-have-vector-test.sh as well as
removing the need for some of the architecture-specific headers.)

Tested for x86_64.

	* sysdeps/x86_64/fpu/test-double-vlen2.c: Move most contents to,
	and include ...
	* sysdeps/x86_64/fpu/test-double-vlen2.h: ... here.  New file.
	* sysdeps/x86_64/fpu/test-double-vlen4-avx2.c: Move most contents
	to, and include ...
	* sysdeps/x86_64/fpu/test-double-vlen4-avx2.h: ... here.  New
	file.
	* sysdeps/x86_64/fpu/test-double-vlen4.c: Move most contents to,
	and include ...
	* sysdeps/x86_64/fpu/test-double-vlen4.h: ... here.  New file.
	* sysdeps/x86_64/fpu/test-double-vlen8.c: Move most contents to,
	and include ...
	* sysdeps/x86_64/fpu/test-double-vlen8.h: ... here.  New file.
	* sysdeps/x86_64/fpu/test-float-vlen16.c: Move most contents to,
	and include ...
	* sysdeps/x86_64/fpu/test-float-vlen16.h: ... here.  New file.
	* sysdeps/x86_64/fpu/test-float-vlen4.c: Move most contents to,
	and include ...
	* sysdeps/x86_64/fpu/test-float-vlen4.h: ... here.  New file.
	* sysdeps/x86_64/fpu/test-float-vlen8-avx2.c: Move most contents
	to, and include ...
	* sysdeps/x86_64/fpu/test-float-vlen8-avx2.h: ... here.  New file.
	* sysdeps/x86_64/fpu/test-float-vlen8.c: Move most contents to,
	and include ...
	* sysdeps/x86_64/fpu/test-float-vlen8.h: ... here.  New file.

1 files changed, 26 insertions, 0 deletions

diff --git a/sysdeps/x86_64/fpu/test-double-vlen2.h b/sysdeps/x86_64/fpu/test-double-vlen2.h
new file mode 100644
index 0000000000..3e3ef8ebf4
--- /dev/null
+++ b/sysdeps/x86_64/fpu/test-double-vlen2.h
@@ -0,0 +1,26 @@
+/* Tests for SSE ISA versions of vector math functions.
+   Copyright (C) 2014-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include_next <test-double-vlen2.h>
+
+#define TEST_VECTOR_cos 1
+#define TEST_VECTOR_sin 1
+#define TEST_VECTOR_sincos 1
+#define TEST_VECTOR_log 1
+#define TEST_VECTOR_exp 1
+#define TEST_VECTOR_pow 1