testsuite
	* gfortran.fortran-torture/execute/intrinsic_leadz.f90: New test.
	* gfortran.fortran-torture/execute/intrinsic_trailz.f90: New test.

fortran/
	PR fortran/37635
	* intrinsic.c (add_functions): Add LEADZ and TRAILZ as generics.
	* intrinsic.h (gfc_simplify_leadz, gfc_simplify_trailz): New protos.
	* gfortran.h <enum gfc_isym_id>: (GFC_ISYM_LEADZ, GFC_ISYM_TRAILZ): New.
	* f95-lang (gfc_init_builtin_functions): Add BUILT_IN_CLZ,
	BUILT_IN_CLZL, BUILT_IN_CLZLL, BUILT_IN_CTZ, BUILT_IN_CTZL, and
	BUILT_IN_CTZLL.
	* trans-intrinsic.c (gfc_conv_intrinsic_leadz,
	gfc_conv_intrinsic_trails): New code-generation functions for LEADZ
	and TRAILZ intrinsics.
	(gfc_conv_intrinsic_function): Use them
	* intrinsic.texi: Add documentation for LEADZ and TRAILZ.
	* simplify.c (gfc_simplify_leadz, gfc_simplify_trailz): New functions.

From-SVN: r140837