[binutils-gdb] gdb/riscv: Handle passing variadic floating point arguments

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 4de3d8d06673d130e256a6ad81e5df2e412934c1 ***

Author: Andrew Burgess <andrew.burgess@embecosm.com>
Branch: master
Commit: 4de3d8d06673d130e256a6ad81e5df2e412934c1

gdb/riscv: Handle passing variadic floating point arguments

This commit fixes some test failures in gdb.base/varargs.exp when
running on targets with floating point hardware.  Floating point
unnamed (variadic) arguments should be passed in integer registers
according to the abi.

After this commit I see no failures in gdb.base/varargs.exp on 32 or
64 bit targets with floating point hardware.

gdb/ChangeLog:

	* riscv-tdep.c (riscv_call_arg_scalar_float): Unnamed (variadic)
	arguments are passed in integer registers.
	(riscv_call_arg_complex_float): Likewise.