re PR rtl-optimization/82973 (ICE in output_constant_pool_2, at varasm.c:3896 on aarch64)

	PR rtl-optimization/82973
	* emit-rtl.h (valid_for_const_vec_duplicate_p): Rename to ...
	(valid_for_const_vector_p): ... this.
	* emit-rtl.c (valid_for_const_vec_duplicate_p): Rename to ...
	(valid_for_const_vector_p): ... this.  Adjust function comment.
	(gen_vec_duplicate): Adjust caller.
	* optabs.c (expand_vector_broadcast): Likewise.
	* simplify-rtx.c (simplify_const_unary_operation): Don't optimize into
	CONST_VECTOR if some element isn't simplified valid_for_const_vector_p
	constant.
	(simplify_const_binary_operation): Likewise.  Use CONST_FIXED_P macro
	instead of GET_CODE == CONST_FIXED.
	(simplify_subreg): Use CONST_FIXED_P macro instead of
	GET_CODE == CONST_FIXED.

	* gfortran.dg/pr82973.f90: New test.

From-SVN: r255939

gcc/testsuite/gfortran.dg/pr82973.f90

+! PR rtl-optimization/82973
+! { dg-do compile }
+! { dg-options "-Ofast -frounding-math" }
+
+program pr82973
+  integer, parameter :: n=16
+  real, dimension(n) :: ar, br, modulo_result, floor_result
+  integer, dimension(n) :: ai, bi , imodulo_result, ifloor_result
+  ai(1:4) = 5
+  ai(5:8) = -5
+  ai(9:12) = 1
+  ai(13:16) = -1
+  bi(1:4) = (/ 3,-3, 1, -1/)
+  bi(5:8) = bi(1:4)
+  bi(9:12) = bi(1:4)
+  bi(13:16) = bi(1:4)
+  ar = ai
+  br = bi
+  modulo_result = modulo(ar,br)
+  imodulo_result = modulo(ai,bi)
+  floor_result = ar-floor(ar/br)*br
+  ifloor_result = nint(real(ai-floor(real(ai)/real(bi))*bi))
+  do i=1,n
+    if (modulo_result(i) /= floor_result(i)) then
+      call abort()
+    end if
+    if (imodulo_result(i) /= ifloor_result(i)) then
+      call abort ()
+    end if
+  end do
+end program pr82973